Keymap: allow filling in existing key-configs

Needed so we can get the preferences of a key-config
which are sent to a function that generates the contents.

release/scripts/modules/bpy_extras/keyconfig_utils.py

@@ -488,6 +488,15 @@ def keymap_items_from_data(km, km_items, is_modal=False):
                     _kmi_props_setattr(kmi_props, attr, value)
 
 
+def keyconfig_init_from_data(kc, keyconfig_data):
+    # Load data in the format defined above.
+    #
+    # Runs at load time, keep this fast!
+    for (km_name, km_args, km_content) in keyconfig_data:
+        km = kc.keymaps.new(km_name, **km_args)
+        keymap_items_from_data(km, km_content["items"], is_modal=km_args.get("modal", False))
+
+
 def keyconfig_import_from_data(name, keyconfig_data):
     # Load data in the format defined above.
     #
@@ -496,10 +505,7 @@ def keyconfig_import_from_data(name, keyconfig_data):
     import bpy
     wm = bpy.context.window_manager
     kc = wm.keyconfigs.new(name)
-    for (km_name, km_args, km_content) in keyconfig_data:
-        km = kc.keymaps.new(km_name, **km_args)
-        keymap_items_from_data(km, km_content["items"], is_modal=km_args.get("modal", False))
-
+    keyconfig_init_from_data(kc, keyconfig_data)
     return kc