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Plot value not restored correctly when interacting with multiple pointers #2431
Description
If the mouse is within the radius of multiple pointers and moves outside of one pointer's max radius, then the plot value will be set to null instead of according to the remaining active pointer.
Example (notebook):
viewof value = Plot.plot({
marks: [
Plot.frame(),
Plot.rect(["foo"], Plot.pointerY({y: d => d, maxRadius: Infinity, fill: "orange"})),
Plot.dot([{y: "foo"}], {y: "y", tip: true})
],
})Steps:
- Move the mouse into the frame on either the left or right side so that
valuereads"foo". - Move the mouse towards the dot until the tip appears; observe that
valuereads{y: "foo"}. - Within the frame, move the mouse away from the dot until the tip disappears; observe that
valuereads null instead of"foo".
Demo:
Activity
Fil commentedon May 7, 2026
related? #2382
mootari commentedon May 7, 2026
I'm afraid not, the problem also exists in dev regardless of the pool setting. I've added another example to the notebook using the unreleased version. The only difference is that with pooling enabled only the latter pointer will override the prior pointer's value to null.
For reference: