834742 - Rendering corruption in the Mac theme without using background:transparent

Status: RESOLVED WORKSFORME

(Core :: Graphics: Layers, defect)

Description

[(no longer active)]

Attachment: Screenshot

Over in my patch for bug 832290, I have a selector like this:

@media (-moz-mac-lion-theme) {
  #main-window[privatebrowsingmode=temporary][inFullscreen] #TabsToolbar::after {
    display: -moz-box;
    content: "";
    width: 50px;
    background: transparent;
  }
}

If I take out the background rule, I get a rendering glitch similar to the screenshot attached.  However, the background rule should not be necessary...

In order to reproduce, apply my patch there if it hasn't been landed when you debug this, activate the tabs-on-bottom mode (by setting the browser.tabs.onTop pref to false), open a private window and press Cmd+Shift+F to go into full-screen mode.  I reproduced it on OS X 10.8.

When this bug gets fixed, we should be able to take out that background rule.

Comment 1

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Is the background rule suppressing -moz-appearance theming?

Comment 2

[(no longer active)]

(In reply to comment #1)
> Is the background rule suppressing -moz-appearance theming?

IIRC -moz-appearance suppresses background, doesn't it?

Comment 3

[Robert O'Callahan (:roc) (email my personal email if necessary)]

User background rules suppress -moz-appearance.

This might be fixed by bug 828146. Retest after that lands.

Comment 4

[(no longer active)]

Couldn't reproduce it after a quick test but I'm not too sure if that would in fact reproduce before bug 828146.  It's been three months after all!