Fix broken spacer tool and thumbnails disappearing with razor and space tools

src/timeline2/model/timelinefunctions.cpp

@@ -246,7 +246,7 @@ bool TimelineFunctions::requestSpacerEndOperation(const std::shared_ptr<Timeline
     // Start undoable command
     std::function<bool(void)> undo = []() { return true; };
     std::function<bool(void)> redo = []() { return true; };
-    int res = timeline->requestClipsGroup(clips, undo, redo);
+    int res = timeline->requestClipsGroup(clips, undo, redo, GroupType::Selection);
     bool final = false;
     if (res > -1) {
         if (clips.size() > 1) {

src/timeline2/view/qml/Clip.qml

@@ -236,10 +236,10 @@ Rectangle {
     }
     MouseArea {
         id: mouseArea
-        visible: root.activeTool === 0
+        enabled: root.activeTool === 0
         anchors.fill: clipRoot
         acceptedButtons: Qt.RightButton
-        hoverEnabled: true
+        hoverEnabled: root.activeTool === 0
         cursorShape: dragProxyArea.drag.active ? Qt.ClosedHandCursor : Qt.OpenHandCursor
         onPressed: {
             root.stopScrolling = true