Draft: improved IsActive behavior (#14103)

Related issue: #14061.

src/Mod/Draft/draftguitools/gui_grid.py

@@ -36,6 +36,7 @@ import FreeCADGui as Gui
 import WorkingPlane
 
 from draftguitools import gui_base
+from draftutils import gui_utils
 from draftutils.translate import translate
 
 
@@ -54,7 +55,6 @@ class ToggleGrid(gui_base.GuiCommandSimplest):
 
     def GetResources(self):
         """Set icon, menu and tooltip."""
-
         return {"Pixmap": "Draft_Grid",
                 "Accel": "G, R",
                 "MenuText": QT_TRANSLATE_NOOP("Draft_ToggleGrid", "Toggle grid"),
@@ -62,6 +62,10 @@ class ToggleGrid(gui_base.GuiCommandSimplest):
                                              "Toggles the Draft grid on and off."),
                 "CmdType": "ForEdit"}
 
+    def IsActive(self):
+        """Return True when this command should be available."""
+        return bool(gui_utils.get_3d_view())
+
     def Activated(self):
         """Execute when the command is called."""
         super().Activated()