_mutate_xxx‘s bug or for some other reason

[1751660300]

hello,
I want to update the ListProp and print its value, but the console outputs the initial value instead of the updated value for the first time. Is he a bug or for some other reason?

The result is :
JS:
JS: D,E,F

my code:

from flexx import flx

class Test(flx.Widget):
    str_list = flx.ListProp(settable=True)

    def init(self):
        self.btn = flx.Button(text='测试')

    @flx.action
    def replace_str_list(self, items):
        # 替换值
        self._mutate_str_list(items, 'set')

    @flx.reaction('btn.pointer_click')
    def main(self, *events):
        self.replace_str_list(['D', 'E', 'F'])
        print(self.str_list)

[almarklein]

Do you mean that on the first click the result is [], and only on the second click it shows the updated value?

In the docs (https://flexx.readthedocs.io/en/stable/event/api.html#actions) it says:

Actions are asynchronous and thread-safe. Invoking an action will not apply the changes directly; the action is queued and handled at a later time. The one exception is that when an action is invoked from anoher action, it is handled directly.

[1751660300]

OK，thanks。