Thematic crash with horizontal menu

Hi all,

during debugging of NSMenu last day with Fred and running Thematic, I 
noticed that a specific theme (WinClassic) makes consistently crash 
Thematic just as it loads it.
Since I was playing with Valgrind anyway, I had a look at that and 
here we get some interesting output.

==1475== Conditional jump or move depends on uninitialised value(s)
==1475==    at 0x52670E4: NSEqualPoints (NSGeometry.m:499)
==1475==    by 0x4BA4C0E: _i_NSMenuView__mouseDown_ (NSMenuView.m:2012)
==1475==    by 0x4C9FFF8: _i_NSWindow__sendEvent_ (NSWindow.m:4154)
==1475==    by 0x4AA041F: _i_NSApplication__sendEvent_ 
(NSApplication.m:2148)
==1475==    by 0x4A9EB9E: _i_NSApplication__run (NSApplication.m:1585)
==1475==    by 0x4A7B58D: NSApplicationMain (Functions.m:123)
==1475==    by 0x584EDFC: (below main) (in /lib64/libc-2.32.so)
==1475==
==1475== Conditional jump or move depends on uninitialised value(s)
==1475==    at 0x52670E6: NSEqualPoints (NSGeometry.m:499)
==1475==    by 0x4BA4C0E: _i_NSMenuView__mouseDown_ (NSMenuView.m:2012)
==1475==    by 0x4C9FFF8: _i_NSWindow__sendEvent_ (NSWindow.m:4154)
==1475==    by 0x4AA041F: _i_NSApplication__sendEvent_ 
(NSApplication.m:2148)
==1475==    by 0x4A9EB9E: _i_NSApplication__run (NSApplication.m:1585)
==1475==    by 0x4A7B58D: NSApplicationMain (Functions.m:123)
==1475==    by 0x584EDFC: (below main) (in /lib64/libc-2.32.so)
==1475==
2020-11-29 00:26:01.980 Thematic[1475:1475] Ignore bottom offset 
change from 1 to 23
2020-11-29 00:26:02.027 Thematic[1475:1475] Reparent was with offset 0 
22
2020-11-29 00:26:02.028 Thematic[1475:1475] Parent border,width,height 
1,352,505

==1475==
==1475== HEAP SUMMARY:
==1475==     in use at exit: 8,296,487 bytes in 54,006 blocks
==1475==   total heap usage: 373,800 allocs, 319,794 frees, 48,873,893 
bytes allocated
==1475==
==1475== LEAK SUMMARY:
==1475==    definitely lost: 40,773 bytes in 562 blocks
==1475==    indirectly lost: 87,747 bytes in 3,812 blocks
==1475==      possibly lost: 4,052,223 bytes in 16,390 blocks
==1475==    still reachable: 4,115,360 bytes in 33,241 blocks
==1475==         suppressed: 384 bytes in 1 blocks
==1475== Rerun with --leak-check=full to see details of leaked memory
==1475==