Oliver Henshaw 52ec170eae Bug 1192394 - Force an image load whenever the thumbnail file changes. r=adw
Add a revision tag to moz-page-thumb URLs. Change it whenever a new
thumbnail is captured and stored to disk. This prevents new loads from
re-using the old cached value even if the document context matches the
stored loadId of the cache entry.

Also drop no-longer needed wait in browser_thumbnails_update.js test.

Restores behaviour of test/head.js:retrieveImageDataForURL to that of
before bug 897880 - i.e. load the thumbnail image in the context of the
top level chrome document (rather than a new tab every time). It's
likely that bug 1192394 is the reason for the test failures observed in
bug 897880 comment #11.
2015-10-29 16:03:00 +01:00
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