AppInfoView: Change app description to Gtk.Label (#1723)

* fix(AppInfoView): Change app description to Gtk.Label

This was originally a Gtk.Label in the very beginning, but early on
was changed to be a Gtk.TextView in
e37fc74

While working on changes to make AppCenter function at narrow window
widths, I noticed that some applications (Notably Veloren in Flathub)
had description widgets that prevented the window from shrinking
below a minimum width which was very wide and unsuitable for narrow
windows. Changing the App description to a label seems to prevent
this, however, I was unsure of the original reasons for the change
to a TextView

* fix(style): minor code style fix

* Update AppData with fix description.

* Update src/Views/AppInfoView.vala

Updates based on feedback in PR

Co-authored-by: Cassidy James Blaede <cassidy@elementary.io>

* Update src/Views/AppInfoView.vala

Set description text property directly instead of using setter

Co-authored-by: Cassidy James Blaede <cassidy@elementary.io>

* Set correct property for label text

* fix: remove extra git file

Co-authored-by: Cassidy James Blaede <cassidy@elementary.io>

src/Views/AppInfoView.vala

@@ -44,7 +44,7 @@ namespace AppCenter.Views {
         private Gtk.Revealer origin_combo_revealer;
         private Hdy.Carousel app_screenshots;
         private Gtk.Stack screenshot_stack;
-        private Gtk.TextView app_description;
+        private Gtk.Label app_description;
         private Widgets.ReleaseListBox release_list_box;
         private Widgets.SizeLabel size_label;
         private Hdy.CarouselIndicatorDots screenshot_switcher;
@@ -445,13 +445,11 @@ namespace AppCenter.Views {
             };
             package_summary.get_style_context ().add_class (Granite.STYLE_CLASS_H2_LABEL);
 
-            app_description = new Gtk.TextView () {
-                cursor_visible = false,
-                editable = false,
-                expand = true,
-                pixels_below_lines = 3,
-                pixels_inside_wrap = 3,
-                wrap_mode = Gtk.WrapMode.WORD_CHAR
+            app_description = new Gtk.Label (null) {
+                // Allow wrapping but prevent expanding the parent
+                width_request = 1,
+                wrap = true,
+                xalign = 0
             };
             app_description.get_style_context ().add_class (Granite.STYLE_CLASS_H3_LABEL);
 
@@ -959,7 +957,7 @@ namespace AppCenter.Views {
                 // This method may be called in a thread, pass back to GTK thread
                 Idle.add (() => {
                     try {
-                        app_description.buffer.text = AppStream.markup_convert_simple (stripped_description);
+                        app_description.label = AppStream.markup_convert_simple (stripped_description);
                     } catch (Error e) {
                         warning ("Failed to parse appstream description: %s", e.message);
                     }