heatmapgl cursor popup can't go wider than the plot is tall

[ssfrr]

I use heatmaps to plot spectrograms represented as matrices. In trying to improve performance I tried using heatmapgl, but it looks like there's an issue with the cursor popover where it stops following the cursor when the X coordinate is greater than 1023.

Example:
https://jsfiddle.net/xfj1yxyu/3/

EDIT: corrected fiddle URL

[etpinard]

cc @dfcreative

[ssfrr]

just realized that 1023 isn't special, but that's the height of my plot (well, 1025, but that's close enough). When the plot is taller than it is wide things seem to be OK.

A smaller (e.g. 50x100) heatmapgl shows the same behavior.

[dy]

Same issue we have with contourgl type of plot.
Codepen.