Status bar always shows stroke width in px, regardless of stroke units and document units

Migrated from: https://bugs.launchpad.net/inkscape/+bug/167238

Steps to reproduce:

• open Inkscape
• create a rectangle
• open Fill & Stroke dialog
• Set stroke units to mm
• Change the stroke width
• Set document units to mm
• Change the stroke width

What happened?

The status bar (bottom left, next to the color of the stroke) always shows the stroke width in px, but doesn't display a unit.

What should have happened?

The displayed stroke width should either have a unit next to it (i.e. px), and respect the units set in the document properties or the Fill & Stroke dialog.

Inkscape Version and Operating System:

• Inkscape Version: 1.1-dev (6b4d57f, 2020-04-01)
• Operating System: Windows 10
• Operating System version: 10.0.18362