owsilhouetteplot: Correct scene geometry update

The scene rect was not adjusted properly when decreasing the bar size
height.

Author: ales-erjavec

Orange/widgets/visualize/owsilhouetteplot.py

@@ -326,20 +326,14 @@ def _replot(self):
 
             self.scene.addItem(silplot)
             self._update_annotations()
-
-            silplot.resize(silplot.effectiveSizeHint(Qt.PreferredSize))
             silplot.selectionChanged.connect(self.commit)
-
-            self.scene.setSceneRect(
-                QRectF(QPointF(0, 0),
-                       self._silplot.effectiveSizeHint(Qt.PreferredSize)))
+            silplot.layout().activate()
+            self._update_scene_rect()
+            silplot.geometryChanged.connect(self._update_scene_rect)
 
     def _update_bar_size(self):
         if self._silplot is not None:
             self._set_bar_height()
-            self.scene.setSceneRect(
-                QRectF(QPointF(0, 0),
-                       self._silplot.effectiveSizeHint(Qt.PreferredSize)))
 
     def _update_annotations(self):
         if 0 < self.annotation_var_idx < len(self.annotation_var_model):
@@ -360,6 +354,9 @@ def _update_annotations(self):
             else:
                 self._silplot.setRowNames(None)
 
+    def _update_scene_rect(self):
+        self.scene.setSceneRect(self._silplot.geometry())
+
     def commit(self):
         """
         Commit/send the current selection to the output.
@@ -541,6 +538,7 @@ def setRowNamesVisible(self, visible):
             self.__rowNamesVisible = visible
             for item in self.__textItems():
                 item.setVisible(visible)
+            self.updateGeometry()
 
     def rowNamesVisible(self):
         return self.__rowNamesVisible