TopIcons Plus incompatible with GNOME 40

[audreytoskin]

If you open GNOME Extensions, TopIcons Plus can't be activated on GNOME 40. A message declares it incompatible. Merely adding "40" or "40.beta" to the shell versions list in metadata.json doesn't help.

[audreytoskin]

(I know phocean isn't actively maintaining this extension anymore, but in case someone in the community notices and can fix the problem...)

On GNOME 40, in GNOME Extensions, the toggle to enable TopIcons Plus is grayed out. When you click the gear icon, it shows a dialog that says "Something's gone wrong", and the "Technical details" section expands to show this backtrace:

TypeError: widget.show_all is not a function

Stack trace:
  buildPrefsWidget@/usr/share/gnome-shell/extensions/[email protected]/prefs.js:184:13
  _init@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:209:40
  OpenExtensionPrefsAsync/<@resource:///org/gnome/Shell/Extensions/js/extensionsService.js:122:28
  asyncCallback@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:115:22
  run@resource:///org/gnome/Shell/Extensions/js/dbusService.js:177:20
  main@resource:///org/gnome/Shell/Extensions/js/main.js:19:13
  run@resource:///org/gnome/gjs/modules/script/package.js:206:19
  start@resource:///org/gnome/gjs/modules/script/package.js:190:8
  @/usr/share/gnome-shell/org.gnome.Shell.Extensions:1:17

[kofemann]

#156