Account for overlaid elements when using subcoordinates_y

[hoxbro]

Fixes #5913

import holoviews as hv
import numpy as np
import panel as pn

np.random.seed(100)
hv.extension("bokeh")

fn = lambda channel: hv.Curve(
    (np.arange(10), np.random.rand(10), channel), "Time", "Channel", label=channel
).opts(subcoordinate_y=True)
subcoord = hv.Overlay([fn(n) for n in "ABCD"], kdims="Channel")
annotation = hv.VSpan(1, 1.5)

pn.panel(annotation * subcoord).servable()
pn.panel(subcoord * annotation).servable()
pn.panel(subcoord).servable()
pn.panel(annotation * subcoord + subcoord * annotation).servable()

TODO:

• Add tests

[codecov-commenter]

Codecov Report

Merging #5950 (1046081) into main (ad31eda) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5950      +/-   ##
==========================================
- Coverage   88.58%   88.56%   -0.02%     
==========================================
  Files         315      315              
  Lines       65511    65523      +12     
==========================================
+ Hits        58031    58033       +2     
- Misses       7480     7490      +10     

Flag	Coverage Δ
ui-tests	23.14% <14.28%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
holoviews/plotting/bokeh/element.py	88.38% <100.00%> (+0.01%)	⬆️
holoviews/tests/plotting/bokeh/test_subcoordy.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[github-actions]

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