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This rewrites scrollbar layout to work with regular reflow rather than box layout. Overall it's about the same amount of code (mostly because nsScrollbarFrame::Reflow is sorta hand-rolled), but it cleans up a bit and it is progress towards removing XUL layout altogether, without getting into much deeper refactoring. This also blocks some other performance improvements and refactorings I want to make in this code. We make some assumptions to simplify the code that to some extent were made already before, both explicitly and by virtue of using XUL layout. In particular, we assume that scrollbar / slider / thumb has no border or padding and that the writing-mode is horizontal ltr. Differential Revision: https://phabricator.services.mozilla.com/D173489 |
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