[Request]: Move most of the dialogs to Adw.Dialog

[000exploit]

Describe the request

A new dialog concept, Bottom Sheets, will be added to the libadwaita library in version 1.5. This will require the use of a new widget, namely Adw.Dialog. On the libadwaita documentation page, you can find examples of how to use this feature and an example of how this widget looks on the screen. IMO, «Compose» should be migrated to this first ASAP.

Docs: https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/class.Dialog.html

Implementation Details

• This follows the GNOME HIG.

[GeopJr]

Thanks for the reminder!

The composer is in the process of being re-written and will use AdwDialogs. (#553 #623)