c64e13ecae
Replace a `StringRef` with `std::string`, so that a copy is made of the grid item identifier. This identifier is used on redraw, to correlate the newly-drawn items with items from the previous redraw. Using a `StringRef` here was problematic when there's local assets, as those can be freed & re-built (which in the case of the report happens on save/undo). Because of this, the reference got corrupted, and the map lookup would fail. The "old items" map now has a copy of the identifier, ensuring it is independent of the data it represents. Co-authored by Julian Eisel. Pull Request: https://projects.blender.org/blender/blender/pulls/141888
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