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Add an initial pass at a layout debug module.
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file which can be viewed in an external tool. It provides a timelapse view of
how the flow tree and fragments changed during the layout process, which makes
it easier to debug layout bugs.
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size calculation for text fragments.
These two fixes are related to the wikipedia metabug #2554.
They don't make the wikipedia page look better (they cause a slight regression in the top caption table), but they are prerequisites for fixing some of the other layout issues that remain.
Added reftests for each of the three cases I have come across that this patch solves.
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The code that managed ranges was buggy - failing on edge cases
such as a span within a span. I have refactored the code so that the
context information for inline formatting can optionally be stored
within a fragment. This seems cleaner to me, and fixes the bugs
encountered when making these changes by removing the need for
the fixup() functionality (and ranges).
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According to the CSS specification, section 8.3.1, margins of the root
element's box do not collapse. Ensure that root flow margins do not
collapse during the assign heights phase.
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overwritten.
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fns used by seq/parallel code paths).
- LayoutContext is renamed to SharedLayoutContext.
- SharedLayoutContext is immutable.
- LayoutContext is a wrapper around SharedLayoutContext + access to local caches (font, style etc).
- Creating a LayoutContext does a single local_data lookup to fetch the cache information.
- Android shares same implementation of context.rs as other platforms.
- LayoutContext can be used from both green thread (parallel layout) and native thread (sequential layout).
- Removes the need for other types (such as FontContext, StyleSharingCandidateCache etc) to be passed around.
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In build_display_list_abs (block.rs) and handle_reflow (layout_task.rs)
255 is incorrectly used instead of 1.0 for color::rgba (255 is correct
with color::rgb but *not* color::rgba).
In cors.rs remove the dead code warning for fn clear.
The function shouldn't be removed since it'll be used in the future
(fn clear is an implementation of http://fetch.spec.whatwg.org/#concept-cache-clear).
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