join-room: add button to copy alias

src/components/dialogs/join_room.rs

@@ -180,6 +180,21 @@ mod imp {
             self.go_back_btn.set_visible(self.can_go_back());
         }
 
+        /// Copy the room alias to the clipboard.
+        #[template_callback]
+        fn copy_room_alias(&self) {
+            let Some(room) = self.room.borrow().clone() else {
+                return;
+            };
+
+            let alias = room.alias();
+            if let Some(alias) = &alias {
+                let obj = self.obj();
+                obj.clipboard().set_text(alias.as_str());
+                toast!(obj, gettext("Matrix room alias copied to clipboard"));
+            }
+        }
+
         /// Update the state of the entry page.
         #[template_callback]
         fn update_entry_page(&self) {

src/components/dialogs/join_room.ui

@@ -145,13 +145,31 @@
                               </object>
                             </child>
                             <child>
-                              <object class="GtkLabel" id="room_alias">
-                                <property name="wrap">true</property>
-                                <property name="wrap-mode">word-char</property>
-                                <property name="justify">center</property>
-                                <style>
-                                  <class name="dim-label"/>
-                                </style>
+                              <object class="GtkCenterBox">
+                                <child>
+                                  <object class="GtkLabel" id="room_alias">
+                                    <property name="wrap">true</property>
+                                    <property name="wrap-mode">word-char</property>
+                                    <property name="justify">center</property>
+                                    <style>
+                                      <class name="dim-label"/>
+                                    </style>
+                                  </object>
+                                </child>
+                                <child type="end">
+                                  <object class="GtkButton">
+                                    <property name="icon-name">copy-symbolic</property>
+                                    <property name="tooltip-text" translatable="yes">Copy Room Alias</property>
+                                    <property name="valign">center</property>
+                                    <property name="hexpand">True</property>
+                                    <property name="halign">start</property>
+                                    <property name="margin-start">6</property>
+                                    <signal name="clicked" handler="copy_room_alias" swapped="yes"/>
+                                    <style>
+                                      <class name="flat"/>
+                                    </style>
+                                  </object>
+                                </child>
                               </object>
                             </child>
                             <child>