Now the wortld generator addon's datalist popup will focus the line edit for changing the resource's name. Also it will accept enter as ok.

game/addons/world_generator/ui/DataList.gd

@@ -13,7 +13,7 @@ var _undo_redo : UndoRedo = null
 
 func _init():
 	connect("item_activated", self, "on_item_activated")
-
+	
 func set_plugin(plugin : EditorPlugin) -> void:
 	_plugin = plugin
 	_undo_redo = _plugin.get_undo_redo()
@@ -115,6 +115,10 @@ func name_edit_dialog_ok_pressed() -> void:
 		name_edited_resource.emit_changed()
 		name_edited_resource = null
 		on_resource_changed()
+		
+func name_edit_dialog_line_edit_text_entered(var s : String) -> void:
+	$NameEditDialog.hide()
+	name_edit_dialog_ok_pressed()
 
 func delete_button_pressed() -> void:
 	var item : TreeItem = get_selected()

game/addons/world_generator/ui/DataList.tscn

@@ -81,4 +81,6 @@ margin_right = 207.0
 margin_bottom = 42.0
 
 [connection signal="confirmed" from="NameDialog" to="." method="name_dialog_ok_pressed"]
+[connection signal="about_to_show" from="NameEditDialog" to="NameEditDialog/VBoxContainer/LineEdit" method="grab_focus" flags=3]
 [connection signal="confirmed" from="NameEditDialog" to="." method="name_edit_dialog_ok_pressed"]
+[connection signal="text_entered" from="NameEditDialog/VBoxContainer/LineEdit" to="." method="name_edit_dialog_line_edit_text_entered"]

game/worlds/test_world/test_world.tres

@@ -398,6 +398,7 @@ zone_bevel = 0.3
 zone_base = 0.0
 
 [sub_resource type="Resource" id=21]
+resource_name = "C"
 script = ExtResource( 3 )
 rect = Rect2( 241, 247, 40, 25 )
 min_size = Vector2i( 1, 1 )