Fix T58657: blender 2.7 keymap Alt+A does not work for animation playback.

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -152,6 +152,12 @@ def _template_items_select_actions(params, operator):
             (operator, {"type": 'I', "value": 'PRESS', "ctrl": True}, {"properties": [("action", 'INVERT')]}),
             (operator, {"type": 'A', "value": 'DOUBLE_CLICK'}, {"properties": [("action", 'DESELECT')]}),
         ]
+    elif params.legacy:
+        # Alt+A is for playback in legacy keymap.
+        return [
+            (operator, {"type": 'A', "value": 'PRESS'}, {"properties": [("action", 'TOGGLE')]}),
+            (operator, {"type": 'I', "value": 'PRESS', "ctrl": True}, {"properties": [("action", 'INVERT')]}),
+        ]
     else:
         return [
             (operator, {"type": 'A', "value": 'PRESS'}, {"properties": [("action", 'TOGGLE')]}),