The style candidate cache had regressed a few times (see #12534), and my
intuition is that being able to disable all style sharing with a single rule in
the page is really unfortunate.
This commit redesigns the style sharing cache in order to be a optimistic cache,
but then reject candidates if they match different sibling-affecting selectors
in the page, for example.
So far the numbers have improved, but not so much as I'd wanted (~10%/20% of
non-incremental restyling time in general). The current implementation is really
dumb though (we recompute and re-match a lot of stuff), so we should be able to
optimise it quite a bit.
I have different ideas for improving it (that may or may not work), apart of the
low-hanging fruit like don't re-matching candidates all the time but I have to
measure the real impact.
Also, I need to verify it against try.
Fix a cached style cascade bug that only manifested in sequential mode
When copying cached styles, keep the `writing_mode` up to date.
---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#11818 (github issue number if applicable).
- [X] There are tests for these changes
EDIT: The test is now working. I ran it with the first commit (the actual fix) reverted and it failed.
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Add a flag to dump the computed style values
I used this to trace #11818 to a style bug, rather than a layout bug.
---
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- [X] These changes do not fix any issues
- [X] These changes do not require tests because debugging
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Removed panic channel, replaced by integrated logging and issue reporting
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Remove the previous ad hoc panic channel, replace it by an integrated logging and panicking mechanism, including crash reporting. All thread panics are now reported, not just content threads.
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- [X] These changes fix#11838
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Check for Resources on case sensitive filesystem
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Case where this is needed:
http://logs.glob.uno/?c=mozilla%23servo&s=1+Jul+2016&e=1+Jul+2016#c471192
Another option is to make the Resources folder on the mac .app bundle be lower case; however, it is standard to have `Resources` in a .app bundle.
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prefs: Make the preferences be guarded by a RwLock instead of a Mutex
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This should reduce unnecessary locks that happen when we read preferences.
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Add `--version` flag
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy --faster` does not report any errors
- [X] These changes fix#11241 (github issue number if applicable).
Either:
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
Not 100% sure of a good way to test this, so I'm submitting as is for feedback. Manually testing it appears to work fine.
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