Spiral tool: dragging the inside handle doesn't update Turns

Migrated from https://bugs.launchpad.net/inkscape/+bug/170447 🕸

Steps to reproduce:

• draw a spiral with the Spiral tool
• drag the outer spiral point around until you have 10 turns (purely for the sake of argument)
• Toolbar's "Change: Turns" should reflect (10.00)
• drag the inner spiral point back 5 turns

What happened?

Toolbar doesn't reflect that change, remaining at 10.00.

What should have happened?

Toolbar should update

Inkscape Version and Operating System:

Original submitter's: N/A, win2k (submitted 2004-11-12)

Migrator's:

• Inkscape Version: 1.1-dev (bc69992, 2020-04-15)
• Operating System: macOS
• Operating System version: 10.13.6 (17G12034)

Additional Information/Comments:

• Buliabyak-users replied...

Actually that's per design. The two handles control two different parameters. The outer is the number of turns, the inner is the inner radius. The "true" number of turns is Turns * (1 - InnerRadius). But maybe you are right that this is somewhat inconsistent. I'm moving this to RFE and I need to think about it some more before changing anything.

...and it died there. By design or not, the theory/mathematics behind the spiral isn't the point here but what information is being displayed to the user.