Window maximised state not retained over close

Perdrix

My application saves the geometry and state in my closeEvent handler:

	QSettings settings;
	settings.beginGroup("MainWindow");
	auto geometry{ saveGeometry() };
	settings.setValue("geometry", geometry);
#ifndef NDEBUG	
	ZTRACE_RUNTIME("Hex dump of geometry:");
	ZTrace::dumpHex(geometry.constData(), geometry.length());
#endif 

	auto windowState{ saveState()};
	settings.setValue("windowState", saveState());
#ifndef NDEBUG	
	ZTRACE_RUNTIME("Hex dump of windowState:");
	ZTrace::dumpHex(windowState.constData(), windowState.length());
#endif

	settings.endGroup();

When I reopen the application I do this in the main window startup code:

	QSettings settings;
	settings.beginGroup("MainWindow");

	auto geometry{ settings.value("geometry", QByteArray()).toByteArray() };
	auto windowState{ settings.value("windowState", QByteArray()).toByteArray() };

#ifndef NDEBUG
	if (geometry.length())
	{
		ZTRACE_RUNTIME("Hex dump of geometry:");
		ZTrace::dumpHex(geometry.constData(), geometry.length());
	}
	if (windowState.length())
	{
		ZTRACE_RUNTIME("Hex dump of windowState:");
		ZTrace::dumpHex(windowState.constData(), windowState.length());
	}
#endif

	restoreGeometry(geometry);
	restoreState(windowState);
	settings.endGroup();

This works most of the time, but if I maximise the application and then close it the window opens at the top left of the desktop with a relatively small size (1152 x 698) rather than maximised.

What am I doing wrong please. I am sure it used to work on Qt 6.4.0 (this is 6.5.1)

The hex dump of the window geometry and state at close time was:

00000041 2023/10/04 04:18:39.307 050688 000023e8     >Hex dump of geometry:
00000042 2023/10/04 04:18:39.307 050688 000023e8     >0000000003822760:  01D9D0CB 00030000 00000000 FFFFFFF9  ................
00000043 2023/10/04 04:18:39.307 050688 000023e8     >0000000003822770:  00000398 0000022C 00000000 00000017  .......,........
00000044 2023/10/04 04:18:39.307 050688 000023e8     >0000000003822780:  00000398 0000022C 00000000 00000000  .......,........
00000045 2023/10/04 04:18:39.307 050688 000023e8     >0000000003822790:  0C000000 00000000 00170000 03980000  ................
00000046 2023/10/04 04:18:39.308 050688 000023e8     >00000000038227A0:  022C                                 .,              
00000047 2023/10/04 04:18:39.308 050688 000023e8     >Hex dump of windowState:
00000048 2023/10/04 04:18:39.308 050688 000023e8     >0000000003737FF0:  000000FF 00000000 FD000000 02000000  ................
00000049 2023/10/04 04:18:39.308 050688 000023e8     >0000000003738000:  00000001 22000002 00FC0200 000001FB  ...."...........
00000050 2023/10/04 04:18:39.308 050688 000023e8     >0000000003738010:  00000016 00450078 0070006C 006F0072  .....E.x.p.l.o.r
00000051 2023/10/04 04:18:39.309 050688 000023e8     >0000000003738020:  00650072 00420061 00720100 00000000  .e.r.B.a.r......
00000052 2023/10/04 04:18:39.309 050688 000023e8     >0000000003738030:  00020000 0001C600 07FFFF00 00000300  ................
00000053 2023/10/04 04:18:39.309 050688 000023e8     >0000000003738040:  00027100 00009CFC 01000000 01FB0000  ..q.............
00000054 2023/10/04 04:18:39.309 050688 000023e8     >0000000003738050:  00160050 00690063 00740075 00720065  ...P.i.c.t.u.r.e
00000055 2023/10/04 04:18:39.310 050688 000023e8     >0000000003738060:  004C0069 00730074 01000001 28000002  .L.i.s.t....(...
00000056 2023/10/04 04:18:39.310 050688 000023e8     >0000000003738070:  71000002 7100FFFF FF000002 71000001  q...q.......q...
00000057 2023/10/04 04:18:39.310 050688 000023e8     >0000000003738080:  5E000000 01000000 04000000 01000000  ^...............
00000058 2023/10/04 04:18:39.310 050688 000023e8     >0000000003738090:  08FC0000 0000

Pl45m4

@Perdrix

What OS are you using?

Note this from here:

On X11, this might not work because an invisible window does not have a frame yet. The window manager will decorate the window later. When this happens, the window shifts towards the bottom/right corner of the screen depending on the size of the decoration frame. Although X provides a way to avoid this shift, some window managers fail to implement this feature.

In addion, it seems that there are a lot of bugs when trying to restore geometry from settings. There are also some workarounds