167c5c6b53
No UI views are used inside popups in the main branch yet, #104831 does this so this issue became apparent. For example tree-view items would not change their collapsed state. UI views require the block to be attached to a region when drawing, so that the matching to previous versions of the tree works. Before this commit the block was attached just after. The `BLI_findindex()` check before attaching the block was already done for other kinds of popups, so this is more in sync now.
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