[3.x] Tree Fix line rendering when drag and dropping TreeItem #52095
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Fixes line rendering when drag-dropping a
TreeItemover "Below" section of a not collapsedTreeItemwith children. The drop preview matches the behavior in the editor's Scene dock:Fixes #46339.
Fixes #52053.
Doesn't fix an issue I've mentioned in this comment: the preview for drop is drawed according to a hardcoded logic and user needs to perform the same logic in his drag and drop code to make the behavior match the preview. Anyway, solving that is out of scope of this PR (I'll open a proposal with a possible solution for it).