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staging/xdg-toplevel-icon: Add new protocol

Sebastian Wick requested to merge swick/wayland-protocols:wip/toplevel-icon into main

This is an alternative to !269 (merged). There are three changes:

  1. Setting the icon is only allowed on unmapped toplevels
  2. The xdg icon theme variant was deleted
  3. The protocol mechanics were changes to have a creator and immutable toplevel icon objects

The protocol can be changed in a new version to...

  • remove the restriction to only being able to set an icon on unmapped toplevels
  • add new creators, such as xdg icon theme

The rationale for only allowing an icon to be set on unmapped toplevels is that...

  • a window either does have or does not have an icon for the entire lifetime
  • it makes it impossible for apps to relay some status via the icon

One disadvantage of this restriction is that wine will apparently not be able to use it. A lot of Windows window management is not possible with wayland right now. The rootful mode continues to work, and wayland might eventually grow a wine protocol to specifically deal with those cases.

The reason for deleting the xdg icon theme variant is that the fate of the spec is uncertain right now.

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