QtWidgets appears behind other windows, and locks current window

[alainxi]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior:

From a Blender load addon, I want to display a Qt popup in front of Ayon’s Load gui
So, I tried this :

from qtpy import QtWidgets
choice = QtWidgets.QMessageBox.warning(None,
                                       "The title",
                                        "The message",
                                        buttons = QtWidgets.QMessageBox.Ok,
                                        defaultButton = QtWidgets.QMessageBox.Ok)

Problem : the popup appears behind the Load gui (which is obviously frozen because it waits for the user to click on the popup).
And you can’t Alt-Tab to switch to that pop-up (you still get the Load gui).

The good news : the popup displays the correct information (I can see it in the minimized windows that appear as part of the Alt-Tab process).

Expected Behavior:

Any QtWidgets (volontary ones, or error popups) should display on top of the current window.

Version

1.0.0

What platform you are running on?

Windows

Steps To Reproduce:

It bugs today in Ayon with Blender 4.0.2 / PySide 6.

It already bugged a year ago in OpenPype with Blender 3.3.2 / PySide 2 :
ynput/OpenPype#6016
ynput/OpenPype#4304

That’s when I try to display a popup on purpose.

Now, let’s try to display a popup as the result of an error.
So, I take an Ayon addon for Blender (for example a Load addon), and I add any obvious python syntax error (not even related to Qt).
A standard Qt popup that displays the error will appear behind the current Ayon gui, and you can’t reach that popup.

I have found a hack to make it work in Blender :

from ayon_core.tools.utils import host_tools
loaderGui_window = host_tools.get_tool_by_name("loader")
choice = QtWidgets.QMessageBox.warning(loaderGui_window, ............

(I have replaced None by loaderGui_window)

Now the popup appears in front of the Ayon–>Load gui (and not behind anymore).
But it only works for a popup I code in my own addon, it obviously doesn’t work for popups that result of an error (as decribed earlier).

And it’s strange I have to specify the parent (other DCCs Load addons have the same kind of QtWidgets.QMessageBox that work all right with None as the parent).

Also, I’m not sure calling get_tool_by_name (to get the parent QtWidget) is a clean method.

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Relevant log output:

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Additional context:

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