Fix same track transition resize glitch

src/timeline2/model/timelinemodel.cpp

@@ -3121,7 +3121,7 @@ int TimelineModel::requestItemResize(int itemId, int size, bool right, bool logU
     std::unordered_set<int> all_items;
     QList <int> tracksWithMixes;
     all_items.insert(itemId);
-    if (logUndo && isClip(itemId)) { 
+    if (logUndo && isClip(itemId)) {
         if (tid > -1) {
             if (right) {
                 if (getTrackById_const(tid)->hasEndMix(itemId)) {

src/timeline2/view/qml/Clip.qml

@@ -634,8 +634,14 @@ Rectangle {
                         var currentClipPos = clipRoot.modelStart
                         var delta = currentFrame - currentClipPos
                         if (delta !== 0) {
-                            if (delta > 0 && clipRoot.mixDuration > 0 && (clipRoot.mixDuration - clipRoot.mixCut - delta < 0)) {
-                                return
+                            if (delta > 0 && (clipRoot.mixDuration > 0 && clipRoot.mixDuration - clipRoot.mixCut - delta < (clipRoot.mixCut == 0 ? 1 : 0))) {
+                                if (clipRoot.mixCut == 0 && clipRoot.mixDuration > 1) {
+                                    delta = clipRoot.mixDuration - clipRoot.mixCut - 1
+                                } else if (clipRoot.mixCut > 0 && clipRoot.mixDuration > clipRoot.mixCut) {
+                                    delta = clipRoot.mixDuration - clipRoot.mixCut
+                                } else {
+                                    return
+                                }
                             }
                             var newDuration = 0;
                             if (root.activeTool === ProjectTool.RippleTool) {