347438 - Transparent background at top-level draws as white rectangle _only_ over the inner browser window

Status: UNCONFIRMED

(Core :: Web Painting, defect)

Description

[Mark Laff]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6

If I add a floating window with a transparent background (and give with transparency) at the top level it paints with transparency over the menubar and the status bar, but with a white background over the inner browser window.

Reproducible: Always

Steps to Reproduce:
1.install the example extension
2.click the "track pointer" button at the bottom of the screen
3.move the mouse over the window, including the menu bar and the inner browser window - an Arrow with transparent background will follow the mouse pointer

Actual Results:  
When the floating window follows the pointer, the "should-be" transparent background is rendered as a white rectangle instead

Expected Results:  
A floating arrow with no visible background should follow the mouse pointer

If this same floating window + transparent background GIF is added to the inner Browser window, the transparency is rendered correctly (ie no white rectangle behind it).

Comment 1

[Mark Laff]

Attachment: Extension which creates a floating mouse-following window with transparency

This extension adds a button to exercise the bug