Open Bug 1250420 Opened 7 years ago Updated 5 years ago

Mousewheel scrolling with "alt" key modifier is broken with APZ enabled

Categories

(Core :: Panning and Zooming, defect, P3)

Unspecified
Windows
defect

Tracking

()

UNCONFIRMED

People

(Reporter: dqeswn, Unassigned)

References

Details

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

I have these settings:

general.smoothScroll.mouseWheel.durationMaxMS;1500
mousewheel.default.delta_multiplier_x;150
mousewheel.default.delta_multiplier_y;150
mousewheel.with_alt.delta_multiplier_x;300
mousewheel.with_alt.delta_multiplier_y;300
mousewheel.withcontrolkey.action;3

When I scroll continously with the alt key pressed the scrolling either starts fast then slows down to a crawl, or its slow from the get go.
Normal scrolling doesn't seem to be affected. Setting the same values for mousewheel.default.* will result in the expected faster scrolling.
Blocks: apz-desktop, e10s
Whiteboard: [gfx-noted]
I can reproduce a difference in scroll distance between APZ and non-APZ scrolling with these prefs. However I'm not seeing the "slow down to a crawl" issue - at least not more so in APZ than non-APZ.
Keywords: correctness
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