Summary:
Ref T7447. Ref T7870. See T7870 for a detailed description of this issue.
NOTE: Replying to these inlines from the UI still does the wrong thing, because we use the database line number, not the UI line number.
Test Plan:
Before:
{F377732}
After:
{F377733}
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T7447, T7870
Differential Revision: https://secure.phabricator.com/D12491
Summary:
This returns the PHID of the current revision owner, or the commit author, if one exists.
NOTE: For drafts, we currently return `null`; I'll fix that in a future change. Should be correct for submitted comments.
Test Plan: Added an inline, nothing seemed broken.
Reviewers: chad
Reviewed By: chad
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D12185
Summary:
Ref T1266. We won't detect a move/copy if fewer than 3 lines are changed.
However, you may move a block like:
Complicated Line A
Trivial Line B
Complicated Line C
...where "Trivial Line B" is something like a curly brace. If you move this block somewhere that happened to previously have a similar trivial curly brace line, we won't be able to find 3 contiguous added lines in order to detect the copy/move.
Instead, consider both changed and unchanged lines when trying to find contiguous blocks. This allows us to detect across gaps where lines were not actually changed.
This new algorithm may be too liberal (for example, we may end up incorrectly identifying moved/copied code before or after changed lines, not just between changed lines), but we can keep an eye on it and tweak it. The algorithm is better factored and better covered, now.
Test Plan:
- Added a unit test for this case.
- Spot-checked a handful of diffs and generally saw behavior that made sense and looked better than before.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T1266
Differential Revision: https://secure.phabricator.com/D12146
Summary:
Ref T1266. This doesn't change any behaviors, but some of this code has a lot of really complicated conditionals and I tried to break that up a bit.
Also, reexpress this stuff in terms of the "structured" parser in D12144.
Test Plan: Unit tests still pass. They aren't hugely comprehensive but did reliably fail when I screwed stuff up.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T1266
Differential Revision: https://secure.phabricator.com/D12145
Summary:
Ref T5644. See some discussion in D8040.
When a file is very large (more than 64KB of text), don't activate syntax highlighting by default. This should prevent us from wasting resources running `pygmentize` on enormous files.
Users who want the file highlighted can still select "Highlight As...".
The tricky part of this diff is separating the headers into "changeset" headers and "undershield" (rendering) headers. Specifically, a file might have these headers/shields:
- "This file is newly added."
- "This file is generated. Show Changes"
- "Highlighting is disabled for this large file."
In this case, I want the user to see "added" and "generated" when they load the page, and only see "highlighting disabled" after they click "Show Changes". So there are several categories:
- "Changeset" headers, which discuss the changeset as a whole (binary file, image file, moved, added, deleted, etc.)
- "Property" headers, which describe metadata changes (not relevant here).
- "Shields", which hide files from view by default.
- "Undershield" headers, which provide rendering information that is only relevant if there is no shield on the file.
Test Plan:
- Viewed a diff with the library map, clicked "show changes", got a "highlighting disabled" header back with highlighting disabled.
- Enabled highlighting explicitly (this currently restores the shield, which it probably shouldn't, but that feels out of scope for this change). The deshielded file is highlighted per the user's request.
- Loaded context on normal files.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: joshuaspence, epriestley
Maniphest Tasks: T5644
Differential Revision: https://secure.phabricator.com/D12132
Summary:
Ref T1460. This just barely works, but throwing it up in case any of it sounds mechanically crazy before we build integrations/UI/etc.
Specifically, these are the behaviors:
- You can mark your own draft comments as "done" before you submit them. The intent is to let reviewers mark their stuff advisory/minor/not-important before they submit it, to hint to authors that they don't expect the feedback to necessarily be addressed (maybe it's a joke, maybe it's just discussion, maybe it's "consider..").
- You can mark others' published comments as "done" if you're the revision/commit author. The intent is to keep this lightweight by not requiring an audit trail of who marked what done when. If anyone could mark anything done, we'd have to have some way to show who marked stuff.
- When you mark stuff done (or unmark it), it goes into a "draft" state, where you see the change but others don't see it yet. The intent is twofold:
- Be consistent with how inlines work.
- Allow us to publish a "epriestley updated this revision + epriestley marked 15 inlines as done" story later if we want. This seems more useful than publishing 15 "epriestley marked one thing as done" stories.
- The actual bit where done-ness publishes isn't implemented.
- UI is bare bones.
- No integration with the rest of the UI yet.
Test Plan: Clicked some checkboxes.
Reviewers: chad, btrahan
Reviewed By: btrahan
Subscribers: paulshen, chasemp, epriestley
Maniphest Tasks: T1460
Differential Revision: https://secure.phabricator.com/D12033
Summary:
Fixes T4452. Ref T2009. There's a hierarchy of changeset rendering power: only low-level calls, use of ChangesetDetailView, then use of ChangesetListView (a list of DetailViews).
Prior to work here, the various changeset rendering controllers got their hands dirty to varying degrees, with some using only the lowest-level rendering pipeline:
- Phriction: no view (lowest level)
- Diffusion: DetailView
- Differential Changeset: DetailView
- Differential Diff: ListView
- Differential Revision: ListView
I brought Phriction up to use DetailView, but want to bring everything all the way up to use ListView. Each composition layer adds more features to diff browsing. In particular, this change enables "Highlight As", switching 1up vs 2up, adding inlines, etc., on the standalone view.
Test Plan:
- Viewed a changeset standalone. Could change highlighting, switch 1up vs 2up, add and edit inlines, etc.
- Viewed a revision; no behavioral changes.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4452, T2009
Differential Revision: https://secure.phabricator.com/D12012
Summary:
Ref T2009. Currently, we do not persist view parameters when making context rendering requests.
The big one is the renderer (1up vs 2up). This makes context on unified diffs come in with too many columns.
However, it impacts other parameters too. For example, at HEAD, if you change highlighting to "rainbow" and then load more context, the context uses the original highlighter instead of the rainbow highlighter.
This moves context loads into ChangesetViewManager, which maintains view parameters and can provide them correctly.
- This removes "ref"; it is no longer required, as the ChangesetViewManager tracks it.
- This removes URI management from `behavior-show-more`; it is no longer required, since the ChangesetViewManager knows how to render.
- This removes "whitespace" since this is handled properly by the view manager.
Test Plan:
- Used "Show Top" / "Show All" / "Show Bottom" in 1-up and 2-up views.
- Changed file highlighting to rainbow, loaded stuff, saw rainbow stick.
- Used "Show Entire File" in 1-up and 2-up views.
- Saw loading chrome.
- No loading chrome normally.
- Made inlines, verified `copyRows()` code runs.
- Poked around Diffusion -- it is missing some parameter handling, but works OK.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D11977
Summary:
See D11468 and D11465. Fixes T5163. Fixes T4105. This makes it practical to test shields, unshielding, moves, etc.
This fixes the issue in D11468, where line maps from whitespace-ignored hunks could have fewer lines than line maps from whitespace-respected hunks, causing a warning.
This encodes the behavior which D11465 changed, making it the canon behavior. Specifically, we do **not** show a shield. I think this is correct. It seems misleading to show "the contents of this file were not changed", because they were changed in both the sense that the file was completely removed, and also changed in the sense that the content itself was (or may have been) changed at the destination. Instead, we just show nothing.
Test Plan:
- Added test coverage.
- Ran tests.
- Used `arc diff --raw --browse` to verify that web behavior was consistent with CLI/test behavior.
Reviewers: joshuaspence, btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4105, T5163
Differential Revision: https://secure.phabricator.com/D11970
Summary: Rename `DifferentialChangesetParser::WHITESPACE_IGNORE_FORCE` to `DifferentialChangesetParser::WHITESPACE_IGNORE_ALL` to better reflect reality.
Test Plan: Viewed a diff with various settings for the "Whitespace changes" option.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D11730
Summary: Rename `DifferentialChangesetParser::WHITESPACE_IGNORE_ALL` to `DifferentialChangesetParser::WHITESPACE_IGNORE_MOST`.
Test Plan: Browsed a diff with a few different settings for "Whitespace changes".
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D11715
Summary:
Ref T7094. We should do a policy query on the files IMO because there exists a scenario where the file gets locked down directly. This requires being a bit more disciplined about setting user, which in turn requires deciding whether or not to show edit / reply links as a separate piece of logic, not conditional on user presence.
This is not the best code but I don't think it gets worse with this and is just some other nuance in any larger cleanup we take on someday.
Test Plan: looked at a revision and noted inline comments rendered correctly with reply / edit actions. looked at a diff standalone and noted no reply / edit actions as expected. looked at a "details" link on a transaction and it rendered correctly. looked at a diff in phriction of page edits and it looked good. grepped around and verified the remaining callsite in diffusion already has the setUser call.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T7094
Differential Revision: https://secure.phabricator.com/D11579
Summary: The shield is just confusing. In one case it doesn't work, and in the other case it just shows you a copy of the file you can see just below except in red. Fixes T4599, T1211. Note T1211 proposed not showing the "move away" file **at all** but I think removing the shield fixes the source of confusion. The code here is a bit if / else if / else if... heavy but this is logically sound.
Test Plan: made a diff where i moved a file then edited it in the new location. viewed diff, saw confusing shield, dropped caches, applied patch, viewed diff and saw no shield. made a diff where I moved a file and didn't edit in new location and saw similar shield disappearness.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T1211, T4599
Differential Revision: https://secure.phabricator.com/D10865
Summary: Fixes T2101. When viewing an image change, show image dimensions, MIME type, and filesize.
Test Plan:
{F190189}
{F190190}
very utility
such wow
Reviewers: mailson, btrahan, chad
Reviewed By: chad
Subscribers: epriestley, Korvin, aran
Maniphest Tasks: T2101
Differential Revision: https://secure.phabricator.com/D5206
Summary: I'm pretty sure that `@group` annotations are useless now... see D9855. Also fixed various other minor issues.
Test Plan: Eye-ball it.
Reviewers: #blessed_reviewers, epriestley, chad
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin, hach-que
Differential Revision: https://secure.phabricator.com/D9859
Summary:
Ref T3116. Add a Herald action "Require legal signatures" which requires revision authors to accept legal agreements before their revisions can be accepted.
- Herald will check which documents the author has signed, and trigger a "you have to sign X, Y, Z" for other documents.
- If the author has already signed everything, we don't spam the revision -- basically, this only triggers when signatures are missing.
- The UI will show which documents must be signed and warn that the revision can't be accepted until they're completed.
- Users aren't allowed to "Accept" the revision until documents are cleared.
Fixes T1157. The original install making the request (Hive) no longer uses Phabricator, and this satisfies our requirements.
Test Plan:
- Added a Herald rule.
- Created a revision, saw the rule trigger.
- Viewed as author and non-author, saw field UI (generic for non-author, specific for author), transaction UI, and accept-warning UI.
- Tried to accept revision.
- Signed document, saw UI update. Note that signatures don't currently //push// an update to the revision, but could eventually (like blocking tasks work).
- Accepted revision.
- Created another revision, saw rules not add the document (since it's already signed, this is the "no spam" case).
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: asherkin, epriestley
Maniphest Tasks: T1157, T3116
Differential Revision: https://secure.phabricator.com/D9771
Summary: Ref T5179. Ref T4045. Ref T832. We can now write non-utf8 hunks into the database, so try to do more reasonable things with them in the UI.
Test Plan: (See screenshots...)
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T832, T4045, T5179
Differential Revision: https://secure.phabricator.com/D9294
Summary: Ran `arc lint --apply-patches --everything` over rP, mainly to change double quotes to single quotes where appropriate. These changes also validate that the `ArcanistXHPASTLinter::LINT_DOUBLE_QUOTE` rule is working as expected.
Test Plan: Eyeballed it.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin, hach-que
Differential Revision: https://secure.phabricator.com/D9431
Summary:
Fixes T5041. Pretty sure this is the issue: if a diff contains a large number of identical lines longer than 30 characters, we end up paying O(N^2) for each set.
Instead, when N > 16, opt to pay 0.
Test Plan: Added a test which dropped from ~100s to ~0 after changes (this diff includes a reduced-strenght version of the test, since parsing a 4,000 line diff is a little bit pricey).
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T5041
Differential Revision: https://secure.phabricator.com/D9178
Summary:
Fixes T4898. After we increased the strictness of the `%s` conversion, most `serialize()` output is rejected from the cache.
Drop the cache, change the column type to latin1_bin, and then use `%B` to mark the data as binary during query construction.
Test Plan: Viewed Differential, saw cache fills.
Reviewers: btrahan, spicyj
Reviewed By: spicyj
Subscribers: epriestley
Maniphest Tasks: T4898
Differential Revision: https://secure.phabricator.com/D9171
Summary: Ref T603. Swaps out most `PhabricatorFile` loads for `PhabricatorFileQuery`.
Test Plan:
- Viewed Differential changesets.
- Used `file.info`.
- Used `file.download`.
- Viewed a file.
- Deleted a file.
- Used `/Fnnnn` to access a file.
- Uploaded an image, verified a thumbnail generated.
- Created and edited a macro.
- Added a meme.
- Did old-school attach-a-file-to-a-task.
- Viewed a paste.
- Viewed a mock.
- Embedded a mock.
- Profiled a page.
- Parsed a commit with image files linked to a revision with image files.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T603
Differential Revision: https://secure.phabricator.com/D7178
Summary: Followup to D6924. Fixes T3824.
Test Plan: deleted a file in a diff. was able to view file content without JS errors
Reviewers: epriestley
Reviewed By: epriestley
CC: Korvin, aran
Maniphest Tasks: T3824
Differential Revision: https://secure.phabricator.com/D6963
Summary:
I don't know if there is something more sinister going on
under the covers, but we have a couple of diffs that trigger:
Unhandled Exception ("BadMethodCallException")
Call to a member function getMetadata() on a non-object
when the diff page is handling its async render calls. One diff
in particular has multiple image adds and thus has a stack of of these
error dialogs to close.
This isn't a new regression, we just haven't gotten around to debugging
it until now (reported on 6/12)
One revision that triggers it has two diffs. If I show Base -> Diff 1
I don't hit the error. When I select Base -> Diff 2, or Diff 1 -> Diff
2, the error triggers.
I don't understand what this means, but this diff avoids the null object
reference that causes the exception.
Test Plan:
Load the offending diff, don't hit the error. The diff loads
the images that were added
Reviewers: epriestley
Reviewed By: epriestley
CC: Korvin, aran
Differential Revision: https://secure.phabricator.com/D6851
Summary: Mostly applies a new call spacing rule; also a few things that have slipped through via pull requests and such
Test Plan: `find src/ -type f -name '*.php' | xargs -n16 arc lint --output summary --apply-patches`
Reviewers: chad
Reviewed By: chad
CC: aran
Differential Revision: https://secure.phabricator.com/D5002
Summary: These are full of PhutilSafeHTML objects now, which are destroyed by JSON serialization.
Test Plan: Dropped cache, then reloaded pages.
Reviewers: vrana
Reviewed By: vrana
CC: aran
Differential Revision: https://secure.phabricator.com/D4942
Summary: Sgrepped for `"=~/</"` and manually changed every HTML.
Test Plan: This doesn't work yet but it is hopefully one of the last diffs before Phabricator will be undoubtedly HTML safe.
Reviewers: epriestley
CC: aran, Korvin
Maniphest Tasks: T2432
Differential Revision: https://secure.phabricator.com/D4927
Summary:
T2345
getConfig throws an Exception when the key does not exist.
Also removes dead code that throws an Exception.
Test Plan:
Reloaded the Phabricator home page. In the process, found
2 Exceptions thrown due to nonexistent keys. After addressing these problems,
the home page loads without Exceptions.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D4541
Summary:
I'm assuming they aren't meant to be there.
Old:
This file has a very large number of changes ({4,032} lines). Show File Contents
New:
This file has a very large number of changes (4,032 lines). Show File Contents
Test Plan:
Saved a 5000-line test file, diffed from /dev/null, uploaded diff to local
instance, viewed.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D4462
Summary:
- The order of operations for file changes is wrong. We need to wrap them in a table, then render the changeset talbe around that table.
- Line data was being set to late, so renderShield() got the wrong line count and rendered empty diffs behind, e.g., generated changes.
Test Plan: Looked at an image change with property changes. Clicked "show file contents" on a generated file.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4432
Summary: The "line count" is always the same as count($this->getOldLines()), and somewhat misleading since it's really "number of rows in the two-up view". D4421 removed the only (or only remaining?) call.
Test Plan: looked at some diffs
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4422
Summary:
This is a half-step toward one-up and test renderers. This is mostly a structural change, and has no user-facing impact. It splits the rendering hierarchy like this:
- Renderer (more methods are abstract than before)
- HTML Renderer (most HTML stuff has moved down from the base to here)
- HTML 1-up (placeholder only -- not yet a functional implementation)
- HTML 2-up (minimal changes, uses mostly old code)
- Test Renderer (unit-testable renderer base, implements text versions of the HTML stuff)
- Test 1-up (selects 1-up mode for test rendering)
- Test 2-up (selects 2-up mode for test rendering)
Broadly, I'm trying to share as much code as possible by splitting rendering into more, smaller stages. Specifically, we do this:
- Combine the various sorts of inputs (changes, context, inlines, etc.) into a single, relatively homogenous list of "primitives". This happens in the base class.
- The primitive types are: old (diff left side), new (diff right side), context ("show more context"), no-context ("context not available") and inline (inline comment).
- Possibly, apply a filtering/reordering step to the primitives to get them ready for 1-up rendering. This mostly removes information, and does a small amount of reordering. This also happens in the base class.
- Pass the primitives to the actual renderer, to convert them into HTML, text, or whatever else. This happens in the leaf class.
The primitive implementation is not yet complete (it doesn't attach as much information to the primitives as it should -- stuff like coverage and copies), but covers the basics.
The existing HTMLTwoUp renderer does not use the primitive path; instead, it still goes down the old path.
Test Plan: Ran unit tests, looked at a bunch of diffs.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4421
Summary:
Fixes T181. I actually have no idea what the original issue in T181 was, but this fixes several problems:
- The code for figuring out whitespace-only changes was extremely confusing and probably buggy (the code for figuring out unchanged files was equally confusing but probably less buggy).
- When rendering a whitespace shield, we did not offer a "Show Changes" link. Instead, show the "Show Changes" link: we can always render the content beneath this link.
- When clicking "Show Changes", we used the current whitespace mode, which might result in a diff with no changes. Instead, force "show all" whitespace mode.
- We never offered a "show changes" link for unchanged files. Instead, offer this link if we can service it.
- When clicking "Show Changes", we pierced the shield but didn't force file content, which would fold the entire file even if it was available. Instead, force the file content.
Test Plan: Generated whitespace-only and no-change diffs. Clicked shield links, or verified no shield link available in no-change-with-no-content. Generated an "@generated" change, verified shield worked correctly.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T181, T2009
Differential Revision: https://secure.phabricator.com/D4407
Summary:
Simplify whitespace-ignoring diffing:
- Currently, we generate two diffs (one ignoring whitespace, one normal) and then copy the //text content// from the normal one to the whitespace-ignoring one.
- Instead, copy the //change types// from the ignoring one to the normal one.
- This is cheaper and much simpler.
- It means that we have the right change types in reparseHunksForSpecialAttributes(), and can simplify some other things.
Simplify whitespace changes, unchanged files, and deleted file detections:
- Currently, we do this inline with a bunch of other stuff, in the reparse step.
- Instead, do it separately. This is simpler.
Simplify intraline whitespace handling:
- Currently, this is a complicated mess that makes roughly zero sense.
- Instead, do it in reparse in a straightforward way.
Partially fix handling of files changed only by changing whitespace.
Partially fix handling of unchanged files.
Test Plan:
- Ran unit tests.
- Created context-less diffs, verified they rendered reasonably.
- Generated a diff with prefix whitespace, suffix whitespace, intraline whitespace, and non-whitespace changes. Verified changes rendered correctly in "ignore most" and "show all" modes.
- Verified unchanged files and files with only whitspace changes render with the correct masks.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4398
Summary:
- Remove 'missingNew', etc. It's impossible for a diff to popluate these, as far as I can tell (I can't generate such a diff, or find any which generate it).
- Add unit tests.
Test Plan: Unit tests, viewed a diff with some missing context.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4393
Summary: D4351 swapped this from a map to a list, and then stopped it from getting to the ChangesetParser so it didn't make it to the Renderer.
Test Plan: Ran "arc diff", copy/pasted it into the web UI. Saw a diff with "context not available" blocks in between missing contexts.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4384
Summary: I forgot to "set it" from the changeset parser.
Test Plan: made a diff with silly whitespace changes. toggled the various whitespace modes and got appropriate results
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4378
Summary: introducing a new friend called DifferentialHunkParser. Sort of like the DifferentialChangesetParser but works with hunks only. tried to grab hunk parsing type things from across the code base and move them into this new class.
Test Plan: unit tests and played around in Differential a bit.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2009
Differential Revision: https://secure.phabricator.com/D4351
Summary: in the re-factor quest this got broken. Turns out NewLines (aka $this->new in the parser) gets updated right up until the very end for showing text changes so instead pass over the total line count to the renderer to get this codepath right.
Test Plan: showed content of some generated files in diffusion and all was well
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2204
Differential Revision: https://secure.phabricator.com/D4237
Summary: pull out some more stuff from the TwoUp renderer that's generically useful. also clean up $xhp variable and add a get method for the $coverage. Finally, fix T2177 while I'm in here.
Test Plan: played around with Differential. Also opened things up in Firefox to verify T2177.
Reviewers: epriestley, vrana
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2009, T2177
Differential Revision: https://secure.phabricator.com/D4161
Summary: Minor issue from D4117, user doesn't get passed down so inline comments are missing their "reply" link.
Test Plan: Looked at Differential, saw reply link.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D4145
