Open Bug 1881886 Opened 1 year ago Updated 1 year ago

Flashes when page up/down without smooth scrolling

Categories

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

Product:
Core
Component:
Panning and Zooming
Type:
defect

Tracking

()

Status:
UNCONFIRMED

People

(Reporter: jcj83429, Unassigned)

References

(Depends on 1 open bug)

Details

How to reproduce:

  1. Disable smooth scrolling and maximize browser window
  2. Go to https://firefox-source-docs.mozilla.org/gfx/AsyncPanZoom.html
  3. Go from top to bottom and bottom to top by holding the Page Up/Down key.

It's most obvious with a 4K display. On a 1080p display, only Page Up shows the glitch and only the top 1/4 of the screen flashes white.

The problem can be mitigated by setting apz.danger_zone_y to the display vertical resolution. Firefox should do this automatically when smooth scrolling is disabled.

Additional details:
OS: Windows 10
Firefox version: 123
GPU: AMD 6650XT

See Also: → 1849666, 1783681
Component: Keyboard Navigation → Panning and Zooming
Product: Firefox → Core

Sounds like something we hope will be fixed by bug 1867419 (a follow-up to bug 1783681).

Severity: -- → S3
Depends on: 1867419
Priority: -- → P3

(In reply to jcj83429 from comment #0)

How to reproduce:

  1. Disable smooth scrolling and maximize browser window
  2. Go to https://firefox-source-docs.mozilla.org/gfx/AsyncPanZoom.html
  3. Go from top to bottom and bottom to top by holding the Page Up/Down key.

It's most obvious with a 4K display. On a 1080p display, only Page Up shows the glitch and only the top 1/4 of the screen flashes white.

I would say this symptom is totally different from bug 1867419 (or bug 1783681). These white flashes are normal checkerboarding, not reverse checkerboarding.

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