Disallow changing a vein into itself #5255
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Prevents infinite recursion from occurring while searching for neighboring vein tiles, which would eventually result in a crash. Fixes DFHack#5231
myk002
approved these changes
Feb 7, 2025
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This adds a check for when the original and target material are the same, providing an error message if attempted.
The algorithm for finding neighboring vein tiles relies upon the original and target materials being different, otherwise it leads to infinite recursion which inevitably ends in a crash.
Fixes #5231