Closed Bug 1264802 Opened 9 years ago Closed 9 years ago

scrollbar drag handle moves on mousedown when APZ drag is enabled

Categories

(Core :: Panning and Zooming, defect)

Product:
Core
Component:
Panning and Zooming
Version:
48 Branch
Platform:
Unspecified
Windows
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED DUPLICATE of bug 1249162
Tracking Flags:
Tracking Status
firefox48 --- unaffected

People

(Reporter: gordonrankin82, Unassigned)

References

Details

(Keywords: correctness, polish, Whiteboard: [gfx-noted])

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36 Steps to reproduce: 1. Enable 'apz.drag.enabled' preference. 2. Go to any webpage that has content long enough to create a visible scrollbar 3. Scroll down the page somewhat (the effect is more pronounced the further down you scroll) 3. Then, from a resting position click on the scrollbar handle. Actual results: The scrollbar handle and the corresponding scroll offset of the page, jumps upwards several pixels. Expected results: As long as the mouse is not moves, the handle and scroll position should have remained static. The issue does not appear when APZ drag is disabled.
Component: Untriaged → Panning and Zooming
Product: Firefox → Core
I can repro on Windows but no OS X, I suspect it's a small miscalculation from the scrollbar buttons or something like that. Marking as blocking the drag meta-bug, but unaffected on 48 because it's not on by default.
Blocks: async-scrollbar-drag
Status: UNCONFIRMED → NEW
status-firefox48: --- → unaffected
Ever confirmed: true
Keywords: correctness, polish
OS: Unspecified → Windows
Whiteboard: [gfx-noted]
Actually we already had this bug on file!
Status: NEW → RESOLVED
Closed: 9 years ago
Resolution: --- → DUPLICATE
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