Feature Request: cursor movement mirror on other subplots if its inside axeies limits

[mablue]

Is your feature request related to a problem? Please describe.
No its just usable when I want to study the must better places of entery and exit in defferent timeframes

Describe the solution you'd like
I need to have a mirrored mouse pointer on all other subplots to see where am I.for example if my mouse on center of 4h timeframe its very useful to see where the place in 8h timeframe.

Describe alternatives you've considered
I think plotly on his volume chart have a mirror to show where is the mouse pointer.also its support moving and scaling for example if data is precent on other subplot if user just drag and scrool on one plot others will move with it and two vertical and horizontal lines will show the exact position of mouse pointer on all otherr charts...

Additional context
it will not care about connected or external axies. the cursor have an x and y position if this option enabled than just will watch to other plots and if the x pos is inside supported range of x axis of other subplot it will draw an horizontal line in this place and if not nothing will happen. and for y similar to x with a vertical line.
and for moving a plot if the range going out it can move and will just try to support all corrently showing subplot on all other charts like a simple ai algorithm.

I have an image to show what I mean:

[DanielGoldfarb]

An interesting idea. Looking around, it appears that a solution similar to this may work: https://stackoverflow.com/a/21585524/1639359 .

If you can code up a working proof-of-concept solution, I will consider doing the work to integrate it into mplfinance.

Obviously, to code up a proof-of-concept solution, you will have to use external axes mode (as you would have done anyway to make the 4 different time ranges as in your example image above).