models: Update to AppStream 1.0

AppStream 1.0.0 includes several API breaks compared to the previous
0.16 (and earlier) versions, but unfortunately both versions used the
same 1.0 GI version, so there is no way to differentiate at import time.
Therefore, enforce the requirement during the build to make this clear.

src/meson.build

@@ -1,6 +1,7 @@
 pkgdatadir = join_paths(get_option('datadir'), meson.project_name())
 gnome = import('gnome')
 
+dependency('appstream', version : '>= 1.0')
 dependency('libadwaita-1', version : '>= 1.5')
 dependency('webkitgtk-6.0', version : '>= 2.40')
 

src/models/applications.js

@@ -326,14 +326,18 @@ var FlatpakApplicationsModel = GObject.registerClass({
         if (component.get_name())
             appdata.name = component.get_name();
 
-        if (component.get_developer_name())
-            appdata.author = component.get_developer_name();
+        const developer = component.get_developer();
+        if (developer && developer.get_name())
+            appdata.author = developer.get_name();
 
         const launchable = component.get_launchable(AppStream.LaunchableKind.DESKTOP_ID);
         if (launchable && launchable.get_entries())
             [appdata.launchable] = launchable.get_entries();
 
-        const [release] = component.get_releases();
+        const releaselist = component.get_releases_plain();
+        if (!releaselist)
+            return appdata;
+        const [release] = releaselist.get_entries();
         if (!release)
             return appdata;