[Feature] Adding what to connect in echarts.connect

[amirajv]

What problem does this feature solve?

• Right now, echarts.connect will connect every aspect of the connected figures (xaxis, yaxis, etc)
• In many cases however, you desire to only connect one aspect.
• Example in Bokeh: https://docs.bokeh.org/en/2.4.3/docs/user_guide/interaction/linking.html#linked-panning
• In the example, xaxis of all 3 figures are connected. But yaxis of only first 2 figures are connected.

What does the proposed API look like?

Proposed API: Adding what to connect in the connect function:

echarts.connect([chart1, chart2, chart3], 'xAxis');
echarts.connect([chart1, chart2], 'yAxis');

[github-actions]

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[amirajv]

Would be great if it can be considered for v6