Fix drag and drop for stacked diagrams (follow-up) #60600
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…s (items don't have children so far), because of that, we can drop at any index as well
…ee view when dropped 'inside' an item
…s dropping handling
… ease drag'n'drop, as well as sorting the eventually multiple dragged subDiagrams to get a clean drop. Additionally, fixes previous copying of items.
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Follow-up #60278.
This PR adjusts issues and improves consistency with drag and drop behavior in other parts of QGIS. See #60596 for screencasts of the buggy behavior in the current master.
Namely, this PR:
Replaces the drop indicator, switching from a box to a horizontal line (which expands to the whole row). The rationale is that stacked diagrams don't handle (yet) a parent-child hierarchy (i.e., one cannot have nested stacked diagrams in the GUI), but act instead as a flat list. This is consistent with drag and drop for other flat lists in QGIS (e.g., classification symbol lists or graduated symbol lists).
Fixes an issue that moves the dropped item to the end of the list (i.e., an append operation), even if the desired position was, e.g., between other items.
Fixes an issue that makes it possible to obtain copies of the dragged object.
Enables moving multiple items and positioning them in the expected way (e.g., if a diagram A is below a diagram B before the drag, it should continue being below B once dropped).
Minor fixes: Allow dropping items below all other items (i.e., in the blank area), as well as in the whole row span (i.e., also for columns > 0).
Screencast of the result:
dragndrop_stackeddiagrams.mp4
Fix #60596