Regression in legend and plot interaction behaviour

[febkor]

Software versions

Python version : 3.11.10 (main, Oct 16 2024, 04:38:48) [Clang 18.1.8 ]
Tornado version : 6.4.2
NumPy version : 1.26.0
Bokeh version : 3.7.0
BokehJS static path : .venv/lib/python3.11/site-packages/bokeh/server/static
node.js version : v20.16.0
npm version : 10.8.1
Operating system : Linux-6.8.0-52-generic-x86_64-with-glibc2.35

Browser name and version

Google Chrome 128.0.6613.114 (Official Build) (64-bit)

Expected behavior

Thank you for this great library.

There appears to be a regression in legend behavior in 3.7 from version 3.6.
The behavior in 3.6 matches expectations.

Observed behavior

How to reproduce:

• go to https://docs.bokeh.org/en/latest/docs/user_guide/interaction/legends.html
• repeat the following instructions using versions 3.6.3 and 3.7.2:
  • go to the plot in the "Hiding glyphs" sections
  • hover over and click on legend labels for each rendered line

Behavioral differences:

• hover
  • 3.6.3: hover shows a mouse pointer over legend label and marker
  • 3.7.2: hover shows a text selection cursor over legend label and mouse pointer over marker
• interaction
  • 3.6.3: clicking to hide greys out the label and marker and hides line
  • 3.7.2: clicking to hide leaves label and marker unchanged and hides line (see screenshot)
• selection
  • 3.6.3: clicking on plot does not select the plot
  • 3.7.2: clicking on plot seems to select the plot element (notice the blue border in the screenshot)

Screenshots

[mattpap]

hover shows a text selection cursor over legend label and mouse pointer over marker

In 3.7 there's partial support for selectable text on the canvas, thus the cursor. We may introduce a mode for toggling text selectablity in the future.

clicking to hide leaves label and marker unchanged and hides line (see screenshot)

This looks like a real regression.

clicking on plot seems to select the plot element (notice the blue border in the screenshot)

In 3.7 we added support for plot focus (e.g. you can <tab> between plots), thus the blueish outline.