551111 - No transparencies for xul:panel elements in Linux

Status: RESOLVED DUPLICATE of bug 408284

(Core :: Widget: Gtk, defect)

Description

[Min Huang]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.6) Gecko/20091216 Iceweasel/3.5.8 (like Firefox/3.5.8)
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.6) Gecko/20091216 Iceweasel/3.5.8 (like Firefox/3.5.8)

No transparencies for xul:panel elements.  The opacity and background-color: transparent css styles are apparently ignored.

(I will make an attachment for this in a bit)

Reproducible: Always

Steps to Reproduce:
1.  Install the test extension on a Linux machine
2.  Click on Panel Test -> Open Panel
3.  A xul panel appears
Actual Results:  
The xul panel appears and is not transparent

Expected Results:  
The xul panel appears and is transparent

This happens for me on Linux; doesn't happen for me on Windows and OSX.

I notice the Ubiquity extension uses a XUL panel but doesn't offer transparencies in Linux.  Installing Ubiquity on a Windows or OSX machine offers transparencies for the panel.

Comment 1

[Min Huang]

Attachment: An extension that opens up a xul panel and tries to be transparent.

Please ignore the name of the extension.  This is just a test extension that shows transparencies on OSX and Windows but not Linux.

Comment 2

[Nickolay_Ponomarev]

See also bug 408284

Comment 3

[Rob Campbell [:rc] (:robcee)]

The Inspector (landed in 3.7a+) uses a panel with transparency for its highlighter. This is going to block this or we'll need to come up with an alternative for linux.

cc'ing Enn.