Fix notifications in narrow view when content is hidden

In narrow view, a room can be selected even if the view currently only
shows the room list and the timeline is hidden.
This commit ensures that in this case, notifications are not suppressed.

src/ChatPage.cpp

@@ -1197,6 +1197,12 @@ ChatPage::getProfileInfo()
           });
 }
 
+bool
+ChatPage::isRoomActive(const QString &room_id)
+{
+        return isActiveWindow() && content_->isVisible() && currentRoom() == room_id;
+}
+
 void
 ChatPage::hideSideBars()
 {

src/ChatPage.h

@@ -207,10 +207,7 @@ private:
         void getProfileInfo();
 
         //! Check if the given room is currently open.
-        bool isRoomActive(const QString &room_id)
-        {
-                return isActiveWindow() && currentRoom() == room_id;
-        }
+        bool isRoomActive(const QString &room_id);
 
         using UserID      = QString;
         using Membership  = mtx::events::StateEvent<mtx::events::state::Member>;