add some debug info for clip move errors

src/timeline2/model/timelinemodel.cpp

@@ -612,18 +612,22 @@ bool TimelineModel::requestClipMove(int clipId, int trackId, int position, bool
 {
     Q_UNUSED(moveMirrorTracks)
     if (trackId == -1) {
+        qWarning() << "clip is not on a track";
         return false;
     }
     Q_ASSERT(isClip(clipId));
     if (m_allClips[clipId]->clipState() == PlaylistState::Disabled) {
         if (getTrackById_const(trackId)->trackType() == PlaylistState::AudioOnly && !m_allClips[clipId]->canBeAudio()) {
+            qWarning() << "clip type mismatch 1";
             return false;
         }
         if (getTrackById_const(trackId)->trackType() == PlaylistState::VideoOnly && !m_allClips[clipId]->canBeVideo()) {
+            qWarning() << "clip type mismatch 2";
             return false;
         }
     } else if (getTrackById_const(trackId)->trackType() != m_allClips[clipId]->clipState()) {
         // Move not allowed (audio / video mismatch)
+        qWarning() << "clip type mismatch 3";
         return false;
     }
     std::function<bool(void)> local_undo = []() { return true; };
@@ -677,7 +681,6 @@ bool TimelineModel::requestClipMove(int clipId, int trackId, int position, bool
     bool hadMix = mixData.first.firstClipId > -1 || mixData.second.secondClipId > -1;
     if (old_trackId == -1 && isTrack(previous_track) && hadMix && previous_track != trackId) {
         // Clip is moved to another track
-
         bool mixGroupMove = false;
         if (mixData.first.firstClipId > 0) {
             allowedClipMixes << mixData.first.firstClipId;
@@ -800,6 +803,7 @@ bool TimelineModel::requestClipMove(int clipId, int trackId, int position, bool
         if (!ok) {
             bool undone = local_undo();
             Q_ASSERT(undone);
+            qWarning() << "clip deletion failed";
             return false;
         }
     }

src/timeline2/model/trackmodel.cpp

@@ -196,12 +196,14 @@ Fun TrackModel::requestClipInsertion_lambda(int clipId, int position, bool updat
         if (allowedClipMixes.isEmpty()) {
             if (!m_playlists[0].is_blank_at(position) || !m_playlists[1].is_blank_at(position)) {
                 // Track is not empty
+                qWarning() << "clip insert failed - non blank 1";
                 return []() { return false; };
             }
         } else {
             // This is a group move with a mix, some clips are allowed
             if (!m_playlists[target_playlist].is_blank_at(position)) {
                 // Track is not empty
+                qWarning() << "clip insert failed - non blank 2";
                 return []() { return false; };
             }
             // Check if there are clips on the other playlist, and if they are in the allowed list
@@ -210,6 +212,7 @@ Fun TrackModel::requestClipInsertion_lambda(int clipId, int position, bool updat
             for (int c : collisions) {
                 if (!allowedClipMixes.contains(c)) {
                     // Track is not empty
+                    qWarning() << "clip insert failed - non blank 3";
                     return []() { return false; };
                 }
             }
@@ -218,7 +221,10 @@ Fun TrackModel::requestClipInsertion_lambda(int clipId, int position, bool updat
     if (target_clip >= count && m_playlists[target_playlist].is_blank_at(position)) {
         // In that case, we append after, in the first playlist
         return [this, position, clipId, end_function, finalMove, groupMove, target_playlist]() {
-            if (isLocked()) return false;
+            if (isLocked()) {
+                qWarning() << "clip insert failed - locked track";
+                return false;
+            }
             if (auto ptr = m_parent.lock()) {
                 // Lock MLT playlist so that we don't end up with an invalid frame being displayed
                 m_playlists[target_playlist].lock();