heatmap: there is a tiny gap between each rect item，how to remove it?

[saberneko]

Version

4.4.0

Reproduction link

https://gallery.echartsjs.com/editor.html?c=xBk-X3QOJ-

Steps to reproduce

just open the link, chart is updated by time

What is expected?

remove gap between each rect item

What is actually happening?

there is a tiny gap between each rect item

[echarts-bot]

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[saberneko]

I update the version to v4.6.0. the problem changes to a obvious line gap. it appears sometimes.

Please check the demo link: https://codepen.io/saberneko-the-bold/pen/PowOmzL

[saberneko]

I update the version to v4.6.0. the problem changes to a obvious line gap. it appears sometimes.

Please check the demo link: https://codepen.io/saberneko-the-bold/pen/PowOmzL