Add workaround for delegate stuck transition bug

Sometimes and randomly, a HListView/HGridView delegate's
add/populate transition will stop before completion.

This especially happens on startup when loading a large room list,
one room might get stuck and left tiny or invisible, despite its
normal space still being taken.

src/gui/Pages/Chat/AutoCompletion/CompletableUserDelegate.qml

@@ -49,4 +49,6 @@ HTile {
             Behavior on color { HColorAnimation {} }
         }
     }
+
+    DelegateTransitionFixer {}
 }

src/gui/Pages/Chat/FileTransfer/Transfer.qml

@@ -33,6 +33,8 @@ HColumnLayout {
 
     Behavior on height { HNumberAnimation {} }
 
+    DelegateTransitionFixer {}
+
     HRowLayout {
         HIcon {
             svgName: "uploading"

src/gui/Pages/Chat/RoomPane/MemberView/MemberDelegate.qml

@@ -171,4 +171,6 @@ HTile {
         value: (roomPane.minimumSize - avatar.width) / 2
         when: avatar && roomPane.width < avatar.width + theme.spacing * 2
     }
+
+    DelegateTransitionFixer {}
 }

src/gui/Pages/Chat/RoomPane/MemberView/MemberDeviceDelegate.qml

@@ -64,4 +64,6 @@ HTile {
         )
         item.trustSet.connect(deviceTile.trustSet)
     }
+
+    DelegateTransitionFixer {}
 }

src/gui/Pages/Chat/Timeline/EventDelegate.qml

@@ -84,6 +84,8 @@ HColumnLayout {
 
     ListView.onRemove: eventList.uncheck(model.id)
 
+    DelegateTransitionFixer {}
+
     Item {
         Layout.fillWidth: true
         visible: model.event_type !== "RoomCreateEvent"