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gh-43699: Defer the drag cursor in tkinter.dnd until the pointer moves - #152371
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serhiy-storchaka merged 2 commits intoJul 5, 2026
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…r moves The drag cursor is now changed only once the pointer starts moving past a small threshold rather than on the initial button press, so that a plain click no longer flashes it. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
# Conflicts: # Lib/test/test_tkinter/test_dnd.py
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The drag cursor was applied to the source widget as soon as the button was pressed, in
DndHandler.__init__(). As a result a plain click (a press and release with no motion) briefly flashed the drag cursor, even though no drag-and-drop actually took place.The cursor is now changed only once the pointer has moved past a small threshold, so that a plain click no longer flashes it. This matches BWidget's pure-Tcl drag-and-drop, which likewise shows drag feedback only after a few pixels of motion.
The original report also proposed making the drag cursor configurable. That part is intentionally left out: neither BWidget nor the native
tkdndpackage (the intended eventual replacement for this module) exposes a cursor option, so a configurable-cursor parameter would be atkinter.dnd-only knob with no precedent and no successor. An application that wants its own cursor can already set it from the drag-and-drop callbacks.This is a behavior change with no new API, so it targets the main branch only.