widget.on_left_click triggers on keyboard press, but not on mouse clicks

[ProditorMagnus]

Game and System Information

• Version: 1.19
• OS: windows

Description of the bug

After running code, dialog appears. When pressing any regular key, (not esc, not enter), on_left_click triggers and chats. When using left click on widget, nothing happens.

Steps to reproduce the behavior

# lua wesnoth.require("wml-utils").handle_event_commands(wml.load("~add-ons/EventLoader/action.cfg"))
[lua]
	code=<<
local T = wml.tag
local chat = wesnoth.interface.add_chat_message
local sf = string.format

function wesnoth.wml_actions.stacked_widget_gui()
        local dialogDefinition = {
                wml.tag.tooltip { id = "tooltip_large" },
                wml.tag.helptip { id = "helptip_large" },
                wml.tag.grid {  wml.tag.row { wml.tag.column {
                        wml.tag.stacked_widget {
                                id = "stacker",
                                definition = "default",
                                T.layer {
                                        T.row { T.column { T.label { id="my_label1",label = "Hello world" } } }
                                },
                                T.layer {
                                        T.row { T.column { T.text_box { id="my_tb" } } }
                                }
                        }
                } } },
        }

        local function preshow(dialog)
			dialog.my_tb:focus()
			dialog.stacker.my_tb.on_left_click = function()
				chat("left click")
			end
        end
        gui.show_dialog(dialogDefinition,preshow)
end

wesnoth.wml_actions.stacked_widget_gui()
>>
[/lua]

Expected behavior

From documentation I would expect on_left_click trigger when left click is used, and not trigger when keyboard is used.

Additional context

https://forums.wesnoth.org/viewtopic.php?p=689120#p689120
https://wiki.wesnoth.org/LuaAPI/types/widget