[fractal] room_settings: Use libhandy style class instead of GtkFrame

[Daniel Garcia Moreno <danigm src gnome org>]

commit f3583b78672478f99ccd255bba9c2aa7790f609e
Author: Christopher Davis <brainblasted disroot org>
Date:   Mon Oct 12 18:43:21 2020 -0700

    room_settings: Use libhandy style class instead of GtkFrame
    
    Allows us to cut out a bit of CSS

 fractal-gtk/res/app.css                  | 14 ++------------
 fractal-gtk/res/ui/room_settings.ui      | 10 +---------
 fractal-gtk/src/widgets/members_list.rs  |  1 +
 fractal-gtk/src/widgets/room_settings.rs |  2 +-
 4 files changed, 5 insertions(+), 22 deletions(-)
---
diff --git a/fractal-gtk/res/app.css b/fractal-gtk/res/app.css
index c302f44c..89246bbe 100644
--- a/fractal-gtk/res/app.css
+++ b/fractal-gtk/res/app.css
@@ -137,18 +137,6 @@ frame.room-directory > border {
   border-radius: 9px;
 }
 
-.room-settings-frame > box {
-  border-radius: 9px;
-}
-
-.room-settings-frame > box > list {
-  border-radius: 9px;
-}
-
-.room-settings-frame > box > label {
-  border-radius: 9px;
-}
-
 row:not(:selected) .member-uid {
   color: @insensitive_fg_color;
 }
@@ -301,6 +289,8 @@ row .timestamp {
 .no_member_search {
   padding: 12px;
   background: @theme_base_color;
+  border-radius: 8px;
+  border: 1px solid @borders;
 }
 
 .message-input {
diff --git a/fractal-gtk/res/ui/room_settings.ui b/fractal-gtk/res/ui/room_settings.ui
index 38a8eb81..17286652 100644
--- a/fractal-gtk/res/ui/room_settings.ui
+++ b/fractal-gtk/res/ui/room_settings.ui
@@ -979,18 +979,10 @@
                                   </packing>
                                 </child>
                                 <child>
-                                  <object class="GtkFrame" id="room_settings_members_list">
+                                  <object class="GtkBox" id="room_settings_members_list">
                                     <property name="visible">True</property>
                                     <property name="can_focus">True</property>
-                                    <style>
-                                      <class name="room-settings-frame"/>
-                                    </style>
                                   </object>
-                                  <packing>
-                                    <property name="expand">False</property>
-                                    <property name="fill">True</property>
-                                    <property name="position">1</property>
-                                  </packing>
                                 </child>
                               </object>
                             </child>
diff --git a/fractal-gtk/src/widgets/members_list.rs b/fractal-gtk/src/widgets/members_list.rs
index 27d40433..0e142016 100644
--- a/fractal-gtk/src/widgets/members_list.rs
+++ b/fractal-gtk/src/widgets/members_list.rs
@@ -47,6 +47,7 @@ impl MembersList {
             self.members.clone(),
             self.admins.clone(),
         );
+        self.container.get_style_context().add_class("content");
         self.error.get_style_context().add_class("no_member_search");
         self.error.set_text(&i18n("No matching members found"));
         b.pack_start(&self.error, true, true, 0);
diff --git a/fractal-gtk/src/widgets/room_settings.rs b/fractal-gtk/src/widgets/room_settings.rs
index 132ec785..878a2873 100644
--- a/fractal-gtk/src/widgets/room_settings.rs
+++ b/fractal-gtk/src/widgets/room_settings.rs
@@ -655,7 +655,7 @@ impl RoomSettings {
             .expect("Can't find room_settings_members_search in ui file.");
         let b = self
             .builder
-            .get_object::<gtk::Frame>("room_settings_members_list")
+            .get_object::<gtk::Box>("room_settings_members_list")
             .expect("Can't find room_settings_members_list in ui file.");
         let label = self
             .builder