Bug#991460: vcmi: aborts when hovering over campaign selection figures

[Johannes Schauer Marin Rodrigues]

Control: tag -1 + patch

Hi,

Quoting fulvio ciriaco (2021-07-24 17:24:37)
> steps to reproduce:
> 1. select new  -> campaign
> 2. move the mouse to select the campaign
> vcmi aborts immediately with the following message:
> 
> Initializing VCMI_Lib: 313 ms
> Screen handler: 8 ms
> Main graphics: 103 ms
> Message handler: 1 ms
> Initialization of VCMI (together): 1126 ms
> corrupted double-linked list
> 
> it happens on different computers, motherboards and graphic cards.
> as a workaround, it is possible to select a campaign opening vcmi in valgrind (very
> slow), saving the first day and reopening normally.

thank you for your bugreport! I can reproduce the problem and the attached
patch fixes it.

Thanks!

cheers, josch
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