TrackContentObject: keep position in paste()

When calling TrackContentObject::paste(), only the content should be
pasted, not the position. This fixes pasting for example note patterns
and is also a more generic solution for the bug fixed in commit
4ec5c6afe1.

Closes #3005649.
(cherry picked from commit 5306f7b0ca)

src/core/track.cpp

@@ -249,7 +249,9 @@ void trackContentObject::paste()
 {
 	if( Clipboard::getContent( nodeName() ) != NULL )
 	{
+		const midiTime pos = startPosition();
 		restoreState( *( Clipboard::getContent( nodeName() ) ) );
+		movePosition( pos );
 	}
 }
 

src/tracks/bb_track.cpp

@@ -462,15 +462,7 @@ void bbTrack::loadTrackSpecificSettings( const QDomElement & _this )
 							it != tl.end(); ++it )
 		{
 			( *it )->getTCO( src )->copy();
-
-			trackContentObject * d = ( *it )->getTCO( dst );
-			// important: remember position of destination TCO as pasting
-			// settings from source TCO will also restore the position of
-			// source TCO
-			const midiTime pos = d->startPosition();
-			d->paste();
-			// and move back to where it belongs!
-			d->movePosition( pos );
+			( *it )->getTCO( dst )->paste();
 		}
 		setName( tr( "Clone of %1" ).arg(
 					_this.parentNode().toElement().attribute( "name" ) ) );