disable polar rotation drag when dragmode = false

[jonfunkhouser]

Fixes #5219

[archmoj]

Thanks very much for the PR.
I was expecting that if we start with a polar graph then set the dragmode to false e.g. by typing

Plotly.relayout(gd, 'dragmode', false);

in the console, it disables the interaction.
But the changes appear to have an effect only after the first mouse up.
Could you please investigate that?

[jonfunkhouser]

Sorry for the delay. I started investigating this, and the only relayout flag that was being set in response to Plotly.relayout(gd, 'dragmode', false) was modebar. It is now checking if dragmode changed to or from false and triggering a relayout in that case.

[archmoj]

It is getting close; but still I can rotate polar_bar-overlay mock right after

Plotly.relayout(gd, 'dragmode', false);

[archmoj]

Thanks for the followup.
Some of the tests are failing now:

1) should not respond to drag interactions on radial drag area when dragmode === false
     Test polar interactions: dragmode === false
     Uncaught Error: waitForDragCover: timeout thrown

2) should not responsd to drag interactions on inner radial drag area when dragmode === false
     Test polar interactions: dragmode === false
     Uncaught Error: waitForDragCover: timeout thrown

3) should not responsd to drag interactions on angular drag area when dragmode === false
     Test polar interactions: dragmode === false
     Uncaught Error: waitForDragCover: timeout thrown

[archmoj]

Thanks very much for the PR and follow ups.
💃