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K Moon 6d326b9edb Increase precision of PDF layout dirty tracking
DocumentLayout now sets a "dirty" bit if (and only if) the layout
changed. The current behavior only looks at changes to the overall
document size, which is inaccurate in cases such as orientation changes
that may change the layout of individual pages, but not the overall
document size (for certain combinations of page sizes).

This doesn't matter in the current code (the DocumentSizeUpdated event
might not fire, which is mostly harmless), but the fix for bug 885110
requires accurately detecting and reporting layout changes to the
viewer's JavaScript code, so DocumentLayout has been instrumented to
detect all current triggers for layout changes:

* Default page orientation changes
* Overall page count changes
* Overall document size changes (possibly redundant)
* Individual page layout rectangle changes

Bug: 885110
Change-Id: I0edfe2ad7af73abd1f176477826901b767c28b2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810032
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: K Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698235}
2019-09-19 22:42:07 +00:00
2019-09-18 15:41:39 +00:00
2019-09-19 22:28:01 +00:00
2019-09-19 01:14:09 +00:00
2019-09-19 21:41:04 +00:00
2019-09-10 17:42:51 +00:00
2019-09-10 17:42:51 +00:00

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