Tooltips no longer appear for anything. Hovering over tabs used to display a tooltip as well as links with title="blah" in the code

Regression range: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ad1c22bcdc27&tochange=a6e0b02521cd

Works: http://hg.mozilla.org/mozilla-central/rev/70698587d13f Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a4pre) Gecko/20100329 Minefield/3.7a4pre ID:20100329114550 Fails: http://hg.mozilla.org/mozilla-central/rev/26be64ca9977 Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a4pre) Gecko/20100329 Minefield/3.7a4pre ID:20100329165317 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=70698587d13f&tochange=26be64ca9977

Backout of 555133 seems to have corrected the missing tool-tips. Tested using latest hourly with cset: http://hg.mozilla.org/mozilla-central/rev/3776e9061c1d

(In reply to comment #4) > Backout of 555133 seems to have corrected the missing tool-tips. > > Tested using latest hourly with cset: > http://hg.mozilla.org/mozilla-central/rev/3776e9061c1d Confirmed

Please Reopen. This is a problem again using with DW/D2D enabled. Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a6pre) Gecko/20100611 Minefield/3.7a6pre Probably with the relanding of bug 555133.

Oddly, this only occurs if gfx.font_rendering.directwrite.enabled is true, one would think this would be more likely impacted by the mozilla.widget.render-mode setting.

OK I guess this makes more sense. Resetting mozilla.widget.render-mode to the default value also fixes the issue. Which makes one think that oddly although there are 2 separate settings here, setting either of them independently does nothing and you need to set both of them to make any difference at all, leading one to ask the question "Why are there 2 preferences here??????"

If you disable DirectWrite, Direct2D doesn't work. GDI fonts can't be drawn to D2D.

Maybe Bas can look into this. It's probably something simple like Windows returning the wrong value for isThemeBackgroundPartiallyTransparent for tooltips.

Actually Chris P might be able to help me debug this.

We're not going to hit D2D for Beta 1.

The tooltips are actually working - they are just completely transparent if default background used. (For example - in facebook where the background is black - they works fine, in speed dial - hovering over a preview should show a tooltip - however - only the shadow is visible)

I use bookmarks as a side bar. Not a sign of tooltips if D2D is enabled.

This seems to be broken again.

File a new bug please.

That seems to be filed as bug 617128. There is also a newer report in bug 684852.