How to get rid of buggy IntelliJ IDEA dialog that won't go away?

Question

This is a bug I run into every couple of days, with IntelliJ IDEA's "Go to Class..." (or "Go to File...") dialog.

Usually it closes normally (when a class is selected or Esc pressed), but sometimes the popup is left behind, in the middle of the screen, on top of everything else. Even when I quit (or kill) IDEA completely, it stays. Example of what it looks like:

Only way I've found to get rid of it is logging out completely and then back in (i.e. restart X / GNOME). But having to do that is very annoying, as it can take 10 minutes or whatever to save (and re-setup afterwards) everything I have open.

Is there any other way to get rid of the buggy popup dialog, while remaining logged in? (Such as restarting some GNOME or X service / process.)

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Using Ubuntu 11.04 and GNOME (not Unity).

IntelliJ IDEA ultimate edition 10.5, running on Sun's JDK 1.6.0_26 (i.e. sun-java6-jdk version 6.26-2natty1)

Some info about the graphics driver:

$ jockey-text -l
xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Disabled, Not in use)

And:

$ sudo lshw -c video
  *-display               
       description: VGA compatible controller
       product: RV730 PRO [Radeon HD 4650]
       vendor: ATI Technologies Inc
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=radeon latency=0
       resources: irq:47 memory:e0000000-efffffff memory:f0100000-f010ffff ioport:1100(size=256) memory:f0120000-f013ffff

Answer 1

Run xkill from the "Run command" window, which can be invoked using alt+f2. Next, click the popup and its process should be killed.

Now, of course, this appears to be a bug in the application. I recommend you report it to the developers.

Answer 2

I asked on Twitter, and one of IntelliJ IDEA developers (Denis Zhdanov) replied:

I've encountered it under my ubuntu as well. Looks like a native problem because it persisted even after killing all java processes

I switched to java7 and Xrender pipeline eventually and don't observe the problem so far

I'm now trying if this helps, and will report back later. To recap, this is what I did:

1. Switched to running IDEA on JRE 7. (If unsure of Java version used, check the Help -> About dialog.)
2. Set the property -Dsun.java2d.xrender=true. As Denis points out, the best way is to edit the file <idea_home>/bin/idea.properties and add sun.java2d.xrender=true on a new line.