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bug#3379: Tooltip is causing crash

From: Jason Rumney
Subject: bug#3379: Tooltip is causing crash
Date: Wed, 03 Jun 2009 20:59:53 +0800
User-agent: Thunderbird (Windows/20090302)

Shannon Jones wrote:
I tried this, and I think it's not the menu that is causing the
crash.  I think it's the tooltip that appears when you hover over
an item on the tool-bar.

Thank you for pointing us in the right direction. It is actually a problem with font backends on Windows. As CVS is down, I can't check in the immediate workaround - which is to add the uniscribe backend to x_create_tip_frame in w32fns.c so:

 register_font_driver (&w32font_driver, f);


 if (uniscribe_available)
   register_font_driver (&uniscribe_font_driver, f);
 register_font_driver (&w32font_driver, f);

The bug still triggers with the same recipe if you do the following:

(add-to-list 'tooltip-frame-parameters '(font-backend . "gdi"))

but I can't reproduce the bug on GNU/Linux doing something similar (substituting "x" for "gdi"), so it still seems to be a Windows specific bug.

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