hv.Cycle does not cycle through markers for bokeh backend

[poplarShift]

In the bokeh backend, only the first marker of the list seems to be used:

import holoviews as hv
import numpy as np
hv.extension('bokeh')
s1 = hv.Dataset(np.random.rand(100,3), ['x', 'y'], 'z'
          ).to(hv.Scatter).overlay().opts(hv.opts.Scatter(size=hv.Cycle([8,15,30]), marker='<'))
s2 = hv.Dataset(np.random.rand(100,3), ['x', 'y'], 'z'
          ).to(hv.Scatter).overlay().opts(hv.opts.Scatter(size=10, marker=hv.Cycle(['cross', 'square', '<'])))

s1+s2

Compare to mpl where everything seems ok:

[philippjfr]

This is related to the batching optimization in the bokeh backend which merges multiple overlays into a single glyph because it is very inefficient to draw a lot of individual glyphs. When this optimization was first introduced it was not possible to cycle markers but since then this has become possible so we should be able to fix this pretty easily.

[poplarShift]

Where does the application of Cycle live?

[philippjfr]

Got a fix in #3707

[poplarShift]

Even better, thanks a lot!