Fix track insertion in mixed view mode.

CCBUG: 403443

src/timeline2/model/timelinemodel.cpp

@@ -410,13 +410,14 @@ int TimelineModel::getTrackSortValue(int trackId, int separated) const
         }
     }
     if (isAudio) {
-        if (aCount > vCount && (trackPos - 1 > aCount - vCount)) {
-            return (aCount - vCount + 1) + 2 * (trackPos - (aCount - vCount +1));
-        }
-        if (aCount == vCount) {
-            return 2 * trackPos;
+        if (aCount > vCount) {
+            if (trackPos - 1 > aCount - vCount) {
+                // We have more audio tracks than video tracks
+                return (aCount - vCount + 1) + 2 * (trackPos - (aCount - vCount +1));
+            }
+            return trackPos;
         }
-        return trackPos;
+        return 2 * trackPos;
     }
     return 2 * (vCount + 1 - trackPos) + 1;
 }

src/timeline2/view/dialogs/trackdialog.cpp

@@ -83,14 +83,19 @@ void TrackDialog::buildCombo()
 
 int TrackDialog::selectedTrackPosition() const
 {
+    bool audioMode = audio_track->isChecked() || arec_track->isChecked();
     if (comboTracks->count() > 0) {
         int position = m_positionByIndex.value(comboTracks->currentData().toInt());
-        if (before_select->currentIndex() == 1) {
+        if (audioMode && KdenliveSettings::audiotracksbelow() == 0) {
+            // In mixed track modes, indexes are sorted differently so above/under have different meaning
+            if (before_select->currentIndex() == 0) {
+                position--;
+            }
+        } else if (before_select->currentIndex() == 1) {
             position--;
         }
         return position;
     }
-    bool audioMode = audio_track->isChecked() || arec_track->isChecked();
     return audioMode ? 0 : -1;
 }