Merge pull request #2766 from vallsv/fix-colormap-size

Update the dialog then show

silx/gui/plot/actions/control.py

@@ -360,8 +360,8 @@ def _actionTriggered(self, checked=False):
 
         # Run the dialog listening to colormap change
         if checked is True:
-            self._dialog.show()
             self._updateColormap()
+            self._dialog.show()
         else:
             self._dialog.hide()