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epriestley 5664c838fb Reduce thumbnail flickering in comment previews
Summary:
Ref T10262. Currently, we always render a tag like this when you `{F123}` an image in remarkup:

```
<img src="/xform/preview/abcdef/" />
```

This either generates the preview or redirects to an existing preview. This is a good behavior in general, because the preview may take a while to generate and we don't want to wait for it to generate on the server side.

However, this flickers a lot in Safari. We might be able to cache this, but we really shouldn't, since the preview URI isn't a legitimately stable/permanent one.

Instead, do a (cheap) server-side check to see if the preview already exists. If it does, return a direct URI. This gives us a stable thumbnail in Safari.

Test Plan:
  - Dragged a dog picture into comment box.
  - Typed text.
  - Thing didn't flicker like crazy all the time in Safari.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10262

Differential Revision: https://secure.phabricator.com/D15646
2016-04-06 15:52:52 -07:00
bin Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
conf Mark some strings for translation 2015-06-09 23:06:52 +10:00
externals Improve Amazon SES code error handling behavior 2016-04-05 17:28:45 -07:00
resources Implement a rough optgroup-based "Move on Workboard" stacked action 2016-04-06 09:15:12 -07:00
scripts Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
src Reduce thumbnail flickering in comment previews 2016-04-06 15:52:52 -07:00
support Use AphrontRequestStream to read request input 2016-03-17 08:08:18 -07:00
webroot Implement a rough optgroup-based "Move on Workboard" stacked action 2016-04-06 09:15:12 -07:00
.arcconfig Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Add custom Cows and Figlet directories to .gitignore 2015-10-08 20:23:05 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
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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