pidgin/pidgin

Convert credentials page to use HdyPreferencesGroup and a list box.

2021-05-12, Elliott Sales de Andrade
68c7ef6c5320
Convert credentials page to use HdyPreferencesGroup and a list box.

* Convert credentials page to use `HdyPreferencesGroup` and a list box.
* Add widget for displaying a credential provider in a list box.
* Convert `PidginCredentialsPage` into `HdyPreferencesPage`.

Testing Done:
Opened Preferences, switch to Credentials page, and see/toggle selected provider.

Reviewed at https://reviews.imfreedom.org/r/644/
.bad-ip {
color: @error_fg_color;
text-shadow: 0 1px @error_text_shadow;
background-image: none;
background-color: @error_bg_color;
}
.good-ip {
color: @question_fg_color;
text-shadow: 0 1px @question_text_shadow;
background-image: none;
background-color: @success_color;
}