Allow using ESC to go back to room list

Fix #392

imports/NeoChat/Page/RoomPage.qml

@@ -26,6 +26,10 @@ Kirigami.ScrollablePage {
     /// Used to determine if scrolling to the bottom should mark the message as unread
     property bool hasScrolledUpBefore: false;
 
+    /// Disable cancel shortcut. Used by the seperate window since it provide its own
+    /// cancel implementation.
+    property bool disableCancelShortcut: false
+
     title: currentRoom.htmlSafeDisplayName
 
     KeyNavigation.left: pageStack.get(0)
@@ -55,6 +59,12 @@ Kirigami.ScrollablePage {
         connection: Controller.activeConnection
     }
 
+    Shortcut {
+        sequence: StandardKey.Cancel
+        onActivated: applicationWindow().pageStack.get(0).forceActiveFocus()
+        enabled: !page.disableCancelShortcut
+    }
+
     Connections {
         target: Controller.activeConnection
         function onJoinedRoom(room, invited) {

imports/NeoChat/Page/RoomWindow.qml

@@ -12,8 +12,14 @@ Kirigami.ApplicationWindow {
     required property var currentRoom
     minimumWidth: Kirigami.Units.gridUnit * 10
     minimumHeight: Kirigami.Units.gridUnit * 15
+
+    Shortcut {
+        sequence: StandardKey.Cancel
+        onActivated: window.close()
+    }
     pageStack.initialPage: RoomPage {
         visible: true
         currentRoom: window.currentRoom
+        disableCancelShortcut: true
     }
 }