import-dialog, sync-indicator: Port to AdwSpinner
As @monster pointed in #1253 (closed), libadwaita is releasing a new replacement for GtkSpinner. This merge request aims to replace all existing GtkSpinner with AdwSpinner. Since libadwaita is still in 1.6.beta, it might be needed to wait for an official release to merge this.
To implement the new widget, I simply had to:
- Change every reference of
GtkSpinner
toAdwSpinner
- Remove the
spinning
-property-related code sinceAdwSpinner
does not implement it (yet?)
Fixes #1253 (closed)