Ensure we don't try to fetch timeline thumbs when disabled

src/timeline2/view/qml/Clip.qml

@@ -289,7 +289,7 @@ Rectangle {
         Loader {
             id: thumbsLoader
             anchors.fill: parent
-            source: parentTrack.isAudio ? "ClipAudioThumbs.qml" : itemType == ProducerType.Color ? "" : "ClipThumbs.qml"
+            source: parentTrack.isAudio ? (timeline.showAudioThumbnails ? "ClipAudioThumbs.qml" : "") : itemType == ProducerType.Color ? "" : timeline.showThumbnails ? "ClipThumbs.qml" : ""
         }
 
         Rectangle {

src/timeline2/view/qml/ClipAudioThumbs.qml

@@ -6,7 +6,7 @@ import com.enums 1.0
 
 Row {
     id: waveform
-    visible: clipStatus != ClipState.VideoOnly && parentTrack.isAudio && timeline.showAudioThumbnails  && !parentTrack.isMute
+    visible: clipStatus != ClipState.VideoOnly && parentTrack.isAudio && !parentTrack.isMute
     opacity: clipStatus == ClipState.Disabled ? 0.2 : 1
     property int maxWidth: 2000
     property int innerWidth: clipRoot.width - clipRoot.border.width * 2

src/timeline2/view/qml/ClipThumbs.qml

@@ -7,7 +7,7 @@ import com.enums 1.0
 Row {
     id: thumbRow
     anchors.fill: parent
-    visible: timeline.showThumbnails && clipRoot.itemType != ProducerType.Color && !isAudio
+    visible: !isAudio
     opacity: parentTrack.isAudio || parentTrack.isHidden || clipStatus == ClipState.Disabled ? 0.2 : 1
     property int thumbWidth: container.height * 16.0/9.0
     property int scrollStart: Math.max(0, scrollView.flickableItem.contentX / timeline.scaleFactor - clipRoot.modelStart)