fd83be0fa5
When the material index of a stroke is out-of-range of the material slots, the strokes are never editable. This makes it hard to even re-assign the material or otherwise remove such strokes. A negative index can happen when curves are added while a Grease Pencil object has no material slots (see #123887). Since `material_index` is a generic attribute and should be allowed any value, strokes with out-of-range indices should be considered editable by default. This patch slightly changes the `get_editable_material_indices` function for tools, such that only __valid__ materials with the "Locked" flag set are considered non-editable. Pull Request: https://projects.blender.org/blender/blender/pulls/132806
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