attachTouchDrag() armed a drag on ANY touch pointerdown and immediately
called preventDefault(), which suppresses the synthesized click
TaskCard.handleClick relies on to call props.onOpen(). There was no
movement threshold, so a finger drifting even ~2-3px on a normal tap --
which is universal on real touch hardware -- was enough to arm the
drag and swallow the open.
Fix: defer starting the drag proxy and calling preventDefault() until
the pointer has actually moved past an 8px threshold (matches the
common native drag-affordance convention). A stationary tap never
crosses the threshold, dragging is never armed, and the click fires
normally. A real drag still claims the gesture identically to before,
just after the same few pixels of travel every touch drag implementation
already tolerates.
The bundle (plugins/kanban/dashboard/dist/index.js) has no build step --
it is hand-maintained directly, as established by prior kanban dashboard
PRs (#114882, #108694) -- so the fix is applied there.
Closes#115568.
Testing: no jsdom/vitest harness exists for this bundle (confirmed by
PR #114882's review follow-up, which explicitly rejected turning a
"live-repro jsdom harness" into a pytest because jsdom/react aren't
declared in the root package.json and the Python CI job has no
node_modules -- such a test would be vacuous in CI). Per that
precedent and the "never read source code in tests" rule (no
regex/substring pin on the bundle text), this PR instead extracts
attachTouchDrag() verbatim at test time via Node (already present:
tests-js/ + vitest are in the repo) and drives it through real
pointerdown/pointermove/pointerup sequences against a minimal DOM
stub -- a behavioral test, not a source-shape test. Proven red on the
unfixed bundle (asserts preventDefault is called on a stationary tap)
and green on the fix; skips cleanly via shutil.which("node") if Node
is unavailable in a given lane.
Verification:
- node tests/plugins/fixtures/kanban_touch_drag_probe.js against the
ORIGINAL (unfixed) bundle: fails with "FAIL: a stationary tap called
preventDefault (suppresses the click)", exit 1 -- confirms the probe
reproduces the reported bug
- Same probe against the fixed bundle: "PASS", exit 0
- scripts/run_tests.sh tests/plugins/test_kanban_dashboard_plugin.py --
42/42 passed (1 new, 41 unchanged)
- node --check plugins/kanban/dashboard/dist/index.js -- syntax OK
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