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ui: Explicitly register custom widget types before use

Philip Withnall requested to merge pwithnall/gnome-software:2157-register-custom-types into main

A change in the linker between Fedora 37 and 38 means that the _get_type() functions for custom widgets are not exported by default. That’s probably a good thing for symbol hygiene, but it also means that the GTK .ui file loader can no longer load them automatically, which means that it can’t instantiate any of gnome-software’s custom widgets.

Fix that by explicitly registering the custom widget types before any of them are first used in a .ui file.

The locations where custom widgets are used was found using the following command; the subsequent edits were made manually:

git grep '"Gs' *.ui | grep -v "<template" | grep '"Gs'

Signed-off-by: Philip Withnall pwithnall@endlessos.org

Fixes: #2157 (closed)

Closes #2157 (closed)

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