Add scrollbar size to scroll frame's intrinsic size if it has non-auto "scrollbar-gutter"
Categories
(Core :: Layout: Scrolling and Overflow, enhancement)
Tracking
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Tracking | Status | |
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firefox97 | --- | fixed |
People
(Reporter: TYLin, Assigned: TYLin)
References
Details
Attachments
(2 files)
Per my conversation with Daniel, we should include the scrollbar-gutter's size to scroll frame's intrinsic size as a workaround of bug 764076 (promised in bug 764076 comment 24).
The code that handles this is in nsHTMLScrollFrame::GetIntrinsicVScrollbarWidth
[1].
Comment 1•2 years ago
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(In reply to Ting-Yu Lin [:TYLin] (UTC-8) from comment #0)
Per my conversation with Daniel, we should include the scrollbar-gutter's size to scroll frame's intrinsic size as a workaround of bug 764076 (promised in bug 764076 comment 24).
To clarify: I do also think this is the correct thing to do, per spec.
It also conveniently provides a workaround for bug 764076, which is nice :) but it's worth doing regardless of that.
The idea here is that, with scrollbar-gutter:stable
, we know that we should set aside some space for the scrollbar (just as we do for overflow:scroll
), and that should be included as part of the element's intrinsic inline size.
Comment 2•2 years ago
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Here's a testcase, where we differ from Chrome due to this bug.
Chrome renders this testcase's 3 boxes as skinny, wide, wide
.
Firefox Nightly disagrees on the second one and renders it as skinny (i.e. we don't request any space for the scrollbar, even though it has scrollbar-gutter:stable
and is requesting to always have space for a scrollbar, just like the 3rd box does via overflow-y:scroll
).
Assignee | ||
Comment 3•2 years ago
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This patch fixed the following:
-
Make the helper support the vertical writing modes since its callers
GetMinISize() and GetPrefISize() are fully aware of the vertical writing modes.
This fixed a testcase with "writing-mode: vertical-lr" in flexbox's
cross-axis-scrollbar.html. Yay! -
Treat scrollbar's intrinsic size "zero" if we have "scrollbar-width: none"
since no scrollbar is showing at all. The test 002.html verifies this scenario. -
Return the scrollbar size if we have "scrollbar-gutter: stable", or twice the
size if we have "scrollbar-gutter: stable both-edges". The test 001.html
verifies this scenario.
Pushed by aethanyc@gmail.com: https://hg.mozilla.org/integration/autoland/rev/28dbb5e40628 Rewrite the helper that computes scrollbar's intrinsic size. r=dholbert
Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/32284 for changes under testing/web-platform/tests
Comment 6•2 years ago
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bugherder |
Upstream PR merged by moz-wptsync-bot
Description
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