Bug summary

Hi all,

I was trying to change the slider handle style....

First, if you try something like suggested in the docs :

my_slider=Slider(ax,'frame',0,10,handle_style={"style":"^","size":20,"facecolor":"r"})

You get:
AttributeError: Line2D.set() got an unexpected keyword argument 'markerstyle'

Then, I switched to:

my_slider=Slider(ax,'frame',0,10,handle_style={"":"^","size":20,"facecolor":"r"})

And this worked well, except for the annoying warning:
UserWarning: marker is redundantly defined by the 'marker' keyword argument and the fmt string "o" (-> marker='o'). The keyword argument will take precedence.

I believe there's an easy fix to this issue:

1. Include :'marker': 'o' in thedefaultsdict. (line 457 in widgets.py)
2. Remove"o" when plotting the handle (line 488 in widgets.py)
3. Update the docs to indicate that an empty string instead of "style" is needed to change the marker style.

I would be honoured to make the modifications myself, but I believe I would need some guidance on how to contribute.

Cheers!

Code for reproduction

importmatplotlib.pyplotaspltfrommatplotlib.widgetsimportSliderfig,ax=plt.subplots()my_slider=Slider(ax,'frame',0,10,handle_style={"style":"^","size":20,"facecolor":"r"})ORmy_slider=Slider(ax,'frame',0,10,handle_style={"":"^","size":20,"facecolor":"r"})

Actual outcome

First output
AttributeError: Line2D.set() got an unexpected keyword argument 'markerstyle'

Second output:
UserWarning: marker is redundantly defined by the 'marker' keyword argument and the fmt string "o" (-> marker='o'). The keyword argument will take precedence.

Expected outcome

To change the slider handle from circle into a triangle without a warning.

Additional information

I believe there's an easy fix to this issue:

1. Include :'marker': 'o' in thedefaultsdict. (line 457 in widgets.py)
2. Remove"o" when plotting the handle (line 488 in widgets.py)
3. Update the docs to indicate that an empty string instead of "style" is needed to change the marker style.

Operating system

MacOS 14.2.1

Matplotlib Version

3.7.2

Matplotlib Backend

qt

Python version

3.9.18

Jupyter version

4.0.8

Installation

conda