ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

python: 3.8.5
bokeh: 2.2.1
jupyter_core: 4.6.3
jupyter_client: 6.1.6
windows 10 Home

Description of expected behavior and the observed behavior

Slope does not draw any line when gradient == 0. I would expect it to draw a horizontal line. Seem funky to have to check if my gradient is

Required Info

• I have searched the issues for my issue and found nothing related and/or helpful
• I have read or at least glanced at the FAQ
• I have read or at least glanced at the Wiki
• `VimDevIc

Currently, the headless mode uses default parameters from PyChromeDevTools for connecting to a chrome headless instance.
https://github.com/maartenbreddels/ipyvolume/blob/e68b72852b61276f8e6793bc8811f5b2432a155f/ipyvolume/headless.py#L53
However, if you use a chrome headless running as docker instance and want to connect from another docker instance (e.g. when using docker-compose), the headl

The iris.cube.Cube methods remove_ancillary_variable, ancillary_variable_dims and cell_measure_dims do not currently accept a name (string) as a valid argument. See #3295 for a simmilar case where this was already adressed for remove_cell_measure.