RE: [gtk-list] GtkTextWidget hangs

[Evan Lawrence <evan worldpath net>]

Depending on what version of gtk you're using, this may have already been fixed
- I found a very similar bug in 1.0.4 that Owen has since fixed, so if you get
the cvs version of gtk you might be all set..

On 21-Jun-98 Matthias Moeller wrote:
> 
> Hi
> 
> I just found a way to make GtkTextWidget hang. To
> reproduce the bug you can use the testgtk program:
> 
> 1. Start the GtkTextWidget-Demo in testgtk.
> 
> 2. Switch word-wrap on.
> 
> 3. Move the cursor to the begin of the first line.
> 
> 4. Hit the return-key 3 times to insert 3 empty lines.
> 
> 5. Move the cursor to the first line again.
> 
> 6. Type 3 lines of "O" without return:
> 
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO<
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO<
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
> 
> 7. Hit return (important!)
> 
> 8. Move the cursor to the first line (1x cursor-up) and
>    then 3 steps to the right.
> 
> 9. Hit the space key. Should now look like:
> 
>    OOO
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO<
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO<
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
> 
> 10. Move the cursor 5 steps to the right and press
>     space again:
> 
>    OOO
>    OOOOO
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO<
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO<
>    OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
> 
> 11. Repeat step 10. -> endless loop.
> 
> 
> 
> In the debugger I found that the endless loop is in
> the function correct_cache_insert(). 
>  After step 10 there is a bad node in the cache-list,
> the ->next and ->prev fields of that node are pointing
> the node itself. This bad node is probably created 
> while inserting the second space (probably in the 
> function swap_lines()).
> 
> 
> Sometimes I even get a segfault while using the 
> TextWidget, but I can't reproduce that yet.
> 
> 
> ciao Matthias
> 
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--
Evan Lawrence