The application does not minimize when you click on its icon in the taskbar using pyqt qml

[Jeinerox]

Describe the bug
Hello! I'm having trouble figuring out why my application isn't minimizing when I use your library. I've noticed that when I combine your library with QQmlApplicationEngine, the application doesn't minimize when I click the icon in the taskbar. This only happens when I use this combination, though, as other PyQt classes work fine.

To Reproduce
Run this code and see if you can minimize the application by using the taskbar icon.

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
import PyTaskbar 

if __name__ == '__main__':
    app = QGuiApplication(sys.argv)
    engine = QQmlApplicationEngine()
    engine.load('interface.qml')
    main_window = engine.rootObjects()[0]
    taskbar_progress = PyTaskbar.Progress(hwnd=int(main_window.winId()))
    taskbar_progress.init()  
    if not engine.rootObjects():
        sys.exit(-1)
    sys.exit(app.exec_())

import QtQuick 2.15
import QtQuick.Controls 2.15
ApplicationWindow {
    visible: true
    width: 400
    height: 300
    title: "Hello World"
    Rectangle {
        anchors.fill: parent
        color: "#ffffff"
        Text {
            text: "Hello, World!"
            anchors.centerIn: parent
            font.pixelSize: 32
            color: "#000000"
        }
    }
}

Expected behavior
The app should minimize when the icon is clicked in the taskbar.

[Jeinerox]

I have no idea how this works, but adding a 5-second delay seems to solve the problem. However, having to wait 5 seconds each time before launching the app is a bit frustrating, to be honest. So, this isn't really a solution to the issue.

edit: It seems that Windows may be involved in this issue, causing the window to become a "ghost window". If you reduce the delay, Windows may not detect that the application has frozen, and minimizing the window may stop working again.

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
import PyTaskbar 
from time import sleep

if __name__ == '__main__':
    app = QGuiApplication(sys.argv)
    engine = QQmlApplicationEngine()
    engine.load('interface.qml')
    main_window = engine.rootObjects()[0]
    sleep(5)
    taskbar_progress = PyTaskbar.Progress(hwnd=int(main_window.winId()))
    taskbar_progress.init()  
    if not engine.rootObjects():
        sys.exit(-1)
    sys.exit(app.exec_())

[timminator]

Noticed the same behavior with my tkinter application today. So this seems to be a general issue.
The following example does also not minimize when you click on its icon in the taskbar:

import tkinter as tk
import PyTaskbar

root = tk.Tk()
root.title('Example')

root.update()

prog = PyTaskbar.Progress(int(root.wm_frame(), 16))
prog.init()
prog.setState('loading')
prog.init()

root.mainloop()

If you comment out lines 9-12 it works again.

Edit:
Also happens with the equivalent 0.1.0 script implementation:

import tkinter as tk
import PyTaskbar
from PyTaskbar import NORMAL, WARNING, ERROR, LOADING

root = tk.Tk()
root.title('Example')

root.update()

prog = PyTaskbar.Progress(int(root.wm_frame(), 16))
prog.set_progress_type(LOADING)

root.mainloop()

[timminator]

I was able to pinpoint the issue. This line here causes this behaviour:

PyTaskbar/PyTaskbar/ProgressAPI.py

Line 37 in d2630f8

taskbar.ActivateTab(hwnd)

If I comment it out the application can be minimized again by clicking on its icon in the taskbar.
I could not see any obvious problems by copying out this line.
What do you think of this @N3RDIUM ?

[N3RDIUM]

I was able to pinpoint the issue. This line here causes this behaviour:

PyTaskbar/PyTaskbar/ProgressAPI.py

Line 37 in d2630f8
taskbar.ActivateTab(hwnd)

If I comment it out the application can be minimized again by clicking on its icon in the taskbar. I could not see any obvious problems by copying out this line. What do you think of this @N3RDIUM ?

Thanks for pointing that out! I'll play around with this today and hopefully fix the issue before tomorrow comes.

[timminator]

Sorry for bothering, but did you find some time to take a look at this?