ravas wrote

The automatic tab feature of dockwidgets does not support icons as far as I know.
Text labeled tabs are easier to differentiate anyhow... it would be a sea of icons otherwise.

The design idea is to expose and keep exposed exactly what a user wants.
Switching tabs would ideally not happen often.
However, the dockwidgets can be arranged however the user wants.

I'm not opposed to merging the circle/arc categories.

A whole dockwidget for two spline tools and one point tool seems excessive to me.
I would just add the splines to the line category and use the misc toolbar shown at the bottom of the image.

Using em for the icon size seems confusing to me.

With the new individual toolbars, category toolbar, custom toolbar and these dockwidgets
there is an abundance of possibilities.

I want to merge soon, so that users can try the various possibilities,
and so that you and other developers can try modification ideas.