[orca-list] Something Hanges Orca when lists are large

[Steve Holmes <steve holmes88 gmail com>]

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I've been noticing a strange problem lately where Orca will get hung
when opening up large lists.  I when I work in nautilus and wanna copy
a file or two into another folder, then Orca hangs.  If I switch to
another text console and kill orca, I can come back and restart and
things go on again.  When this hang occurs, I get errors showing up on
my console where I started gnome from that look like this.

(file-roller:31587): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_height:
assertion `GDK_IS_PIXBUF (pixbuf)' failed

I got this error when I attempted to open up a nested folder inside a
zip file.  But I get similar messages when my hangs happen in
nautilus.  In those messages, the program name is nautilus, of course
instead of fileroller.  But I think you get the idea.

The key here is those funny messages and the fact that Orca hangs.  If
orca finally gets going agin (sometimes it does after some time), then
any previously pressed keystrokes are then spoken.

This with a git pull of atk, at-spi and orca from today April 25th.
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