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epriestley befeb17f6f Improve the construction of synthetic "comparison/intradiff" changesets
Summary:
Ref T13523. Currently, when building a "comparison" changeset, metadata is taken from the left changeset. This is somewhat arbitrary.

This means that intradiffs of images don't work properly because the rendered changeset has only the left (usually "old") information.

Later, some of the code attempts to ignore the file data stored on the changeset and reconstruct the correct file data, which is how the result ends up not-completely-wrong.

Be more careful about building sensible-ish metadata, and then just use it directly later on. This fixes the "spooky" code referencing D955 + D6851.

There are some related issues, where "change type" and "file type" are selected arbitrarily and then used to determine whether the change has an "old/new" state or not (i.e., is the left side of the diff empty, since the change creates the file)?

In many cases, neither of the original changesets have a "change type" which will answer this question correctly. Separate this concept from "has state" from "change type", and make more of the code ask narrower questions about the specific conditions or states it cares about, rather than "change type".

Test Plan:
  - Created a revision with Diff 1, Diff 2, and Diff 3. Diff 1 takes an image from "null -> A". Diff 2 takes the same image from "null -> B". Diff 3 takes the same image from "A -> B'.
  - Intradiffed 1v2 and 1v3.
  - Before patch:
    - Left side usually missing, which is incorrect (should always be "A").
    - Change properties are a mess ("null -> image/png" for MIME type, e.g.)
    - Uninteresting/incorrect "unix:filemode" stuff.
  - After patch;
    - Left side shows state "A".
    - Change properties only show size changes (which is correct).

{F7402012}

Maniphest Tasks: T13523

Differential Revision: https://secure.phabricator.com/D21180
2020-04-28 05:09:22 -07:00
bin Remove the "ssh-auth-key" script 2019-10-28 17:52:37 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Merge a small amount of remaining "libphutil/" code with Phabricator, break libphutil dependency 2020-02-12 15:17:36 -08:00
resources Stick the page footer in the right place on Formation View pages 2020-04-24 11:25:31 -07:00
scripts Update a Phabricator -> Arcanist include path for scripts in Phabricator 2020-02-14 08:32:26 -08:00
src Improve the construction of synthetic "comparison/intradiff" changesets 2020-04-28 05:09:22 -07:00
support Use "@" to silence "GC list" warnings from "apc_store()" and "apcu_store()" 2020-04-28 04:13:37 -07:00
webroot Stick the page footer in the right place on Formation View pages 2020-04-24 11:25:31 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Continue moving classes with no callers in libphutil or Arcanist to Phabricator 2020-02-12 13:14:04 -08:00
.arcunit
.editorconfig
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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