HoloViews/Bokeh aspect not being respected, and different behavior with fast template

[droumis]

ALL software version info

versions

Python : 3.9.16 | packaged by conda-forge | (main, Feb 1 2023, 21:38:11) [Clang 14.0.6 ] Operating system : macOS-13.4.1-arm64-arm-64bit holoviews : 1.17.0

bokeh : 3.2.1
colorcet : 3.0.1
cudf : -
dask : 2023.7.1
datashader : 0.15.1
geoviews : -
hvplot : 0.8.4
ibis : -
IPython : 8.14.0
jupyter_bokeh : -
jupyterlab : 4.0.3
matplotlib : 3.7.2
networkx : 3.1
notebook : 7.0.0
numba : 0.57.1
numpy : 1.24.4
pandas : 2.0.3
panel : 1.2.1
param : 1.13.0
PIL : 10.0.0
plotly : -
pyarrow : 12.0.1
scipy : 1.11.1
skimage : 0.21.0
spatialpandas : -
streamz : -
xarray : 2023.7.0

Description of expected behavior and the observed behavior

Setting a holoviews/bokeh plot to be responsive with a set aspect should fill the available space to the extent that it maintains the aspect ratio.

Additionally, when aspect is set, there is a different behavior during the use of the 'fast' template for served apps: all other templates (or no template) fill the available height and width (see images below), whereas the use of the 'fast' template stretches only the width.

@philippjfr 's summary:

• Explicit sizing_mode not respected if child has scaling sizing mode
  • For example a Bokeh/HoloViews plot with aspect forces a scaling sizing mode on the container.
• Fast template does not implement correct CSS for scaling sizing modes

Complete, minimal, self-contained example code that reproduces the issue

import numpy as np
import holoviews as hv; hv.extension('bokeh')
import panel as pn; pn.extension(template='fast')

data = np.random.rand(10, 10)
image = hv.Image(data).opts(aspect=1.5, responsive=True)

panel = pn.Column(image, min_height=100).servable() 

Stack traceback and/or browser JavaScript console output

Screenshots or screencasts of the bug in action

1. Using fast template: only width is stretched (but not respecting aspect)

2. Using any other template (or no template): both height and width are stretched (but not respecting aspect)

[philippjfr]

Looks like a similar issue to #5054. Can you confirm if it's the same and close if it is?

[droumis]

The part of aspect not being respected in general does look similar, but it remains an additional issue that things are broken in a unique way with the fast template. So I think this should probably stay open