6fab30a767
Object::actcol assignments from edit-mode data wasn't clamping the index to the valid range. This caused an out of bounds read when accessing Object::matbits. While material indexes should typically be within the material bounds, this isn't guaranteed. Selecting a face for example with a material outside the range was crashing. Add a utility function that sets the active material index to replace existing inline checks. Follow up to the fix for #139369.
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