fix: revert static drop mode for tree grid #3786
Merged
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A while ago, #3444 updated the grid examples to set the drop mode dynamically. However, in tree grids, setting the drop mode dynamically on drag start causes an immediate reset of the scroll position. This completely disrupts the drag-and-drop process unless the grid is at the top. While losing the scroll position is a known limitation in tree grids, we should avoid recommending configurations that result in a reset right at the start of dragging.
Related to vaadin/flow-components#6662