611718 - Rendering issues with scrollable frames (select-option, iframe and others)

Status: RESOLVED DUPLICATE of bug 611498

(Core :: Graphics, defect)

Description

[d.a.]

User-Agent:       Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8pre) Gecko/20101112 Firefox/4.0b8pre
Build Identifier: 

Starting with the 12 Nov nightly I'm experiencing rendering issues with any scrollable frames such as iframes, select-option boxes or even the addon-manager. 

It seems when new content appears in the frame it will not only render that but also what was rendered at the top of the frame before you started scrolling.

See attached screenshot and a testcase where the rendering issue will appear when scrolling. 

Working changeset: 0f17e5f1eb01
Broken changeset: 35dfd6a0ace7

Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=0f17e5f1eb01&tochange=35dfd6a0ace7

Maybe something form this changeset: http://hg.mozilla.org/mozilla-central/pushloghtml?changeset=25b3b51ca9ee

Reproducible: Always

Comment 1

[d.a.]

Attachment: Screenshot of the issue

Comment 2

[d.a.]

Attachment: Testcase

Scrolling in this iframe will cause the rendering issue to appear.