Update of bug #21874 (project freeciv):

                 Summary: Windows Freeciv 2.4.2 GTK access violation causes
client crash => Misc Windows Freeciv 2.4.2 client crashes with access
violations

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Follow-up Comment #2:

2. Second backtrace in comment #0:

Something went horribly wrong when the user changed an enumerated option.
Can't easily tell which option, unfortunately.
Not sure what went wrong, either. From the disassembly, don't *think* it can
be as simple as poption->changed_callback being duff.


0040AE83  _option_changed
0040BF88  _option_enum_set_int
00485898  _option_dialog_option_apply
0048704C  _option_dialog_reponse_callback
63A48C6F  C:\Program Files\Freeciv-2.4.2-gtk2\libgobject-2.0-0.dll:63A48C6F 
g_cclosure_marshal_VOID__INTv
...


Disassembly of option_changed() up to 0040AE83, in case anyone better at
reading x86 assembler can guess the problem:


0040ae6c <_option_changed>:
  40ae6c:       55                      push   %ebp
  40ae6d:       89 e5                   mov    %esp,%ebp
  40ae6f:       53                      push   %ebx
  40ae70:       83 ec 24                sub    $0x24,%esp
  40ae73:       8b 5d 08                mov    0x8(%ebp),%ebx
  40ae76:       85 db                   test   %ebx,%ebx
  40ae78:       74 22                   je     40ae9c <_option_changed+0x30>
  40ae7a:       80 3d e0 44 5d 00 00    cmpb   $0x0,0x5d44e0
  40ae81:       74 4d                   je     40aed0 <_option_changed+0x64>
> 40ae83: <     8b 43 10                mov    0x10(%ebx),%eax
  40ae86:       85 c0                   test   %eax,%eax
  40ae88:       74 05                   je     40ae8f <_option_changed+0x23>
  ...


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