[Backport release-3_42] [ux] Fix and harmonize drag and drop in Graduated, Categorized and Point Cloud classification symbol lists#60751

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alexbruy merged 5 commits intorelease-3_42from backport-60546-to-release-3_42

Feb 26, 2025

+34-9

Commits on Feb 25, 2025

[ux] In graduated and categorized symbol lists, make sure we don't append to the end when dropping an item between other items (fix #50823 )

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[ux] In Point cloud classification list, make sure we don't append to the end when dropping an item between other items (fix #60559 )

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[ux] Symbology drag'n'drop harmonization: Make sure symbology items being dragged are properly sorted to guarantee that they keep the same relative order when dropped (i.e., higher items before bei…

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[ux] Symbology drag'n'drop harmonization: Once items are drag'n'dropped in Point Cloud classification list, clear item selection.

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[ux] Symbology, drag and drop on flat lists: Add comments to clarify the approach and perhaps avoid eventual regressions later

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