Fix filter members field after switching room

harmonyqml/backend/client.py

@@ -340,6 +340,14 @@ class Client(QObject):
         return self.nio.room_contains_unverified(room_id)
 
 
+    @pyqtSlot(str, str, result=str)
+    def getMemberFilter(self, room_category: str, room_id: str) -> str:
+        return self.manager.backend.accounts[self.userId]\
+                   .roomCategories[room_category]\
+                   .rooms[room_id]\
+                   .sortedMembers.filter
+
+
     @pyqtSlot(str, str, str)
     def setMemberFilter(self, room_category: str, room_id: str, pattern: str
                        ) -> None:

harmonyqml/components/Chat/RoomSidePane/MembersView.qml

@@ -31,6 +31,13 @@ HColumnLayout {
         placeholderText: qsTr("Filter members")
         backgroundColor: HStyle.sidePane.filterRooms.background
 
+        // Without this, if the user types in the field, changes of room, then
+        // comes back, the field will be empty but the filter still applied.
+        Component.onCompleted:
+            text = Backend.clients.get(chatPage.userId).getMemberFilter(
+                chatPage.category, chatPage.roomId
+            )
+
         onTextChanged: Backend.clients.get(chatPage.userId).setMemberFilter(
             chatPage.category, chatPage.roomId, text
         )