Tray: Fix too-wide icon spacing after mate-polkit has been used w sni

Note that vertical and horizontal panels require different options in the grid, as "homogenous" is needed in rows for horizontal panels and columns in vertical panels to prevent icon rendering problems including icons growing without limit when the tray is moved from a horizontal to a vertical panel

applets/notification_area/na-grid.c

@@ -145,13 +145,17 @@ refresh_grid (NaGrid *self)
 
   if (orientation == GTK_ORIENTATION_HORIZONTAL)
     {
+      gtk_grid_set_row_homogeneous (GTK_GRID (self), TRUE);
+      gtk_grid_set_column_homogeneous (GTK_GRID (self), FALSE);
       rows = MAX (1, allocation.height / self->min_icon_size);
       cols = MAX (1, length / rows);
       if (length % rows)
         cols++;
     }
   else
     {
+      gtk_grid_set_row_homogeneous (GTK_GRID (self), FALSE);
+      gtk_grid_set_column_homogeneous (GTK_GRID (self), TRUE);
       cols = MAX (1, allocation.width / self->min_icon_size);
       rows = MAX (1, length / cols);
       if (length % cols)
@@ -243,6 +247,7 @@ na_grid_init (NaGrid *self)
 
   gtk_grid_set_row_homogeneous (GTK_GRID (self), TRUE);
   gtk_grid_set_column_homogeneous (GTK_GRID (self), TRUE);
+
 }
 
 static void