Open Bug 1673517 Opened 4 years ago Updated 1 year ago

White blank area appears on 100% height root element contents when the dynamic toolbar is hidden

Categories

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

Unspecified
Android
defect

Tracking

()

Tracking Status
firefox84 --- affected

People

(Reporter: hiro, Unassigned)

References

(Blocks 1 open bug)

Details

Attachments

(2 files)

Attached file A test case

Attaching file is a test case what Botond raised a question in Matrix. The case is 100% height root element. If the case is zoomed in and scrolled down, then the dynamic toolbar is hidden, then the white area appears where the dynamic toolbar was.

This is because, in my understanding, the root composition size is the same size of the 100% height root element. We probably need to expand the composition size.

This patch eliminates the white blank area, but unfortunately it introduces another problem that is that we can no longer restore the zoom ratio to 1.0 due to restrictions in APZ side, probably this line.

We need to figure out a good way to resolve this issue properly.

Severity: -- → S3
OS: Unspecified → Android
Priority: -- → P3

This is probably not an urgent one. In the test case in comment 0 I also see a similar issue on Chrome, on Chrome it's red blank area instead, and it's less noticeable and disappear once after user's finger left from the touch screen.

See Also: → 1739340

Here is an additional test case: attachment 9187912 [details].

On Firefox Daylight 95.2.0 and Nightly 97.0.a1 on Android, scrolling down exposes white space at bottom below the footer. The white space appears whether address bar is at top of bottom.

On Chrome 96.0.4664.104 on Android, Firefox 95.0.2 and Edge 96.0.1054.62 on Windows, Firefox 95.0.2 and Chromium 96.0.4664.110 on Ubuntu Linux, no white space is ever shown below the footer.

This arose from bug 1663000 comment 17. (See "issue 2" within text.)

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