Buttons should be greyed out if no action is possible with symbolic icons

Steps to reproduce:

  • open Inkscape
  • make sure to use symbolic icons
  • look into the command bar

What happened?

  • The Undo button is not greyed out. It is greyed out with the normal variant. Same for the items in the snap controls bar.

What should have happened?

  • It should be greyed out, as it was in Inkscape 0.92.4

Inkscape Version and Operating System:

  • Inkscape Version: 1.0alpha2 (d608e91480, 2019-07-14)
  • Operating System: Linux Mint 19.2
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