fix scrolling regression

qtgui/playhead.py

@@ -65,6 +65,7 @@ class Playhead(QtWidgets.QGraphicsLineItem):
         #self.hide()
         #self.maxHeight = QtWidgets.QDesktopWidget().geometry().height() #we really hope the screen resolution does not change during the session.
 
+
     def setCursorPosition(self, tickindex:int, playbackStatus:bool):
         """the tickindex to pixel index on the x axis is a fixed 1:n
         relation. What you see is where you are. No jumps, the playhead
@@ -83,11 +84,9 @@ class Playhead(QtWidgets.QGraphicsLineItem):
             #y = self.parentScoreScene.parentView.verticalScrollBar().value()
             #self.parentScoreScene.parentView.centerOn(x, y)
 
-            #r = self.parentScoreScene.parentView.mapToScene(self.parentScoreScene.parentView.geometry())
-            #x -=QtCore.QRectF(r.boundingRect()).width()
-            #self.parentScoreScene.parentView.horizontalScrollBar().setValue(x * constantsAndConfigs.zoomFactor)
-
-            self.parentScoreScene.parentView.centerOn(self)
+            r = self.parentScoreScene.parentView.mapToScene(self.parentScoreScene.parentView.geometry())
+            x -= QtCore.QRectF(r.boundingRect()).width() / 2
+            self.parentScoreScene.parentView.horizontalScrollBar().setValue(x * constantsAndConfigs.zoomFactor)
 
     def setRecordingMode(self, state:bool):
         if state:

qtgui/scoreview.py

@@ -183,8 +183,7 @@ class ScoreView(QtWidgets.QGraphicsView):
         if update:
             self._oldWidth = width
             r = self.sceneRect()
-            r.setWidth(width) #previously we had widht*1.5 here to keep the playback cursor in the middle of the screen.
-                              #however, this does widen exponentially *1.5 which is bad for performance
+            r.setWidth(width+300) #previously we had widht*1.5 here to keep the playback cursor in the middle of the screen.                              #however, this does widen exponentially *1.5 which is bad for performance
                               #and also the screen extends needlesly to the right
             self.setSceneRect(r)
             self.scoreScene.grid.adjustRhythmLines()