810599 - Tiles get marked as invalid/outside content area, causing automatic zoom into remaining content and unable to pan until zoomed out

Status: RESOLVED DUPLICATE of bug 810933

(Firefox for Android Graveyard :: Toolbar, defect)

Description

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Attachment: screenshot invalid areas

Firefox for Android nightly 20121110, Android 4.1.2 (stock), Google Nexus S

Starting with the 20121108 nightly, the following behavior can be observed:

Some areas (tiles?) are not shown and regarded as "no content area" (see screenshot). If you tap onto a remaining, valid content area, the app will automatically zoom in and panning won't allow you to move the invalid area into the viewport, sometimes trapping you in the current viewport. Zooming out usually repaints the area and allows to pan again.
Often this behavior kicks in during panning, causing surprise moves and zoom of the content in view.

Example pages where I observed this behavior:
1. https://addons.mozilla.org (see screenshot)
2. http://www.dwdl.de/full/ zoom in onto the newsbox on the right and keep some space left of it in the view. Then try to move left.
2. http://m.rockstargames.com/newswire

Seems like the more resources needed, the more likely this can be observed.