Qbittorrent tray icon issue with Qt5 5.11.1

[firew4lker]

qBittorrent version and Operating System

Version: 4.1.1
O.S.: Arch Linux

If on linux, libtorrent and Qt version

libttorrent: 0.13.7
Qt5: 5.11.1

What is the problem

If I open the application and close it to the system tray, if I click to restore it, the application doesn't show anything. No controls. Just a blank for. The application seems to function normally though (I can control Qbittorent from web interface). I also noticed that the issue occurs only when closing the application from the "x". If I bring up from the tray by clicking the icon it opens just fine. Once I close it to tray, using the "x", it wont restore normally.

This is the change that causes the issue:

http://code.qt.io/cgit/qt/qtbase.git/commit/?id=e0b5ff4a

[zeule]

Copying the logic from MainWindow::event() for QEvent::WindowStateChange into MainWindow::closeEvent() seems to fix the problem:

   if (!m_forceExit && m_systrayIcon && goToSystrayOnExit && !this->isHidden()) {
-        hide();
-        e->accept();
+        e->ignore();
+        QTimer::singleShot(0, this, &QWidget::hide);

[mthw0]

I can confirm, I also have this issue.

[rawlife56]

Can comfirm this too.

[noquierouser]

Can confirm this issue too. As stated by @firew4lker, clicking Hide in the tray icon and then Show from that same icon has the expected behavior. Yet when clicking the window Close button and then clicking Show on the tray icon shows a blank window.

[onlined]

@zeule Will you open a PR about this? If you don't want to, I can open too.