538612 - Artifacts visible when scrolling inside iframes with overflow:scroll

Status: RESOLVED WORKSFORME

(Firefox for Android Graveyard :: General, defect)

Description

[Tobias (:Tobbi) Markus]

Attachment: Screenshot showing the artifacts on the Fennec windows build

I found out that, when you try to scroll with finger inside iframes with CSS overflow:scroll set, you're getting huge artifacts.

Steps to reproduce:
1. Open http://www.chrisfinke.com/oauth/twitterbar
2. Click (type) inside one of the Mahalo boxes with Fennec.
3. Move the finger up and down.

Results:
Huge artifacts are visible when 'scrolling' up and down.

Comment 1

[Mardeg]

Changed the URL to a slightly more reduced testcase.
http://tinyurl.com/helpingushelpu
The artifacts are visible in the 2nd and 5th iframe when using either the arrow keys to scroll or dragging with your stylus/finger after a page refresh.

Builds tested:

Mozilla/5.0 (X11; U; Linux armv7l; en-US; rv:1.9.2) Gecko/20100107 Firefox/3.6 Fennec/1.0.0

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2b6pre) Gecko/20091231 Namoroka/3.6b6pre Fennec/1.0rc1

Comment 2

[Martijn Wargers (dead)]

Attachment: testcase1, using iframes

The tinyurl link isn't currently working inside Fennec, because of bug 661604.
However, this bug can still be seen. The text will disappear at certain points, while panning inside the iframes. Note that you can encounter bug 673138 with this testcase.

Comment 3

[Martijn Wargers (dead)]

Attachment: testcase1, using overflow:scroll divs

Comment 4

[Martijn Wargers (dead)]

Attachment: Screenshot of bug of testcase2

Comment 5

[Martijn Wargers (dead)]

I guess this might be a Core->Layout bug (only visible in Fennec)? Maybe it has something to do with shadow layers (whatever that means)?

Comment 6

[Mark Finkle (:mfinkle) (use needinfo?)]

This problem looks like it's a gecko issue. It affects Fennec, but needs to be fixed on the platform.

Comment 7

[Alex Keybl [:akeybl]]

[Triage Comment]
Please re-nominate if this is still needed for Fennec 10 (or rather, Native Fennec?). We should also move this out of the Fennec component if we believe this is a platform bug.

Comment 8

[Kevin Brosnan [Ex-Mozilla]]

Need to check this behavior on Fennec native. If it applies to native move to Fennec native.

Comment 9

[Kevin Brosnan [Ex-Mozilla]]

Marking works for me on Firefox for Android.