wxGUI: set region if auto-zooming is enabled or layer tree contains

only one map layer


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57588 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/lmgr/layertree.py

@@ -1478,8 +1478,10 @@ class LayerTree(treemixin.DragAndDrop, CT.CustomTreeCtrl):
         # change parameters for item in layers list in render.Map
         self.ChangeLayer(layer)
         
-        # set region if auto-zooming is enabled
-        if dcmd and UserSettings.Get(group = 'display', key = 'autoZooming', subkey = 'enabled'):
+        # set region if auto-zooming is enabled or layer tree contains
+        # only one map layer
+        if dcmd and (len(self.GetVisibleLayers()) < 2 or \
+                         UserSettings.Get(group = 'display', key = 'autoZooming', subkey = 'enabled')):
             mapLayer = self.GetLayerInfo(layer, key = 'maplayer')
             if mapLayer.GetType() in ('raster', 'vector'):
                 render = UserSettings.Get(group = 'display', key = 'autoRendering', subkey = 'enabled')