d.mon: write frame info to cmd line (allows zooming in wx0 monitors)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@65308 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.mon/render_cmd.py

@@ -53,6 +53,9 @@ def update_cmd_file(cmd_file, cmd, mapfile):
     if fd is None:
         grass.fatal("Unable to open file '{}'".format(cmd_file))
     if mode == 'a':
+        frame = os.getenv('GRASS_RENDER_FRAME', None)
+        if frame:
+            fd.write('# GRASS_RENDER_FRAME={}\n'.format(frame))
         if mapfile:
             fd.write('# GRASS_RENDER_FILE={}\n'.format(mapfile))
         fd.write(' '.join(gtask.cmdtuple_to_list(cmd)))