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Objective
Fixes #14147.
Solution
Modify the slicing checks and algorithm to fully allow asymmetrical textures to work.
Some opinionated code cleanup.
Testing
Tested using the ui_texture_slice example and a custom asymmetrical texture.
Before:
![asymmetrical_texture_slice_before](https://private-user-images.githubusercontent.com/88861660/346062188-00dafce1-904a-41ac-b5d9-faaf087b0681.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.NnSZKuDdBILfYxp4o1HUL1dpZwV7UQMfEHUttSbpJFs)
After:
![asymmetrical_texture_slice_after](https://private-user-images.githubusercontent.com/88861660/346062235-f3d742f3-6157-4d35-b383-aee4b8f6e7d0.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.ApkdE-SHYQlT4DGC0KeoVXn7EySsQZFSctcT8kQPtl4)