wxGUI: merge from releasebranch, https://trac.osgeo.org/grass/changeset/52928

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@52930 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/mapdisp/frame.py

@@ -880,7 +880,7 @@ class MapFrame(SingleMapFrame):
         vparam = self.tree.GetPyData(self.tree.layer_selected)[0]['cmd']
         for p in vparam:
             if '=' in p:
-                parg,pval = p.split('=')[0:2]
+                parg,pval = p.split('=', 1)
                 if parg == 'icon': icon = pval
                 elif parg == 'size': size = float(pval)