WhatsThis '?' not showing

nekkceb

I have a large application that I recently updated from Qt 5.15 (32-bit, MinGW) to Qt 6.6 (64-bit MinGW). The little ''?" in the upper right of all my dialog boxes no longer appears, so my whatsthis help pop-ups do not work.
The source code for the two compilations is EXACTLY the same.
Screen shot for 5.15, 32-bit:

And here is the same screen with the Qt 6.6, 64-bit:

Where is the whatsThis '?'. I do not see this issue in the change logs, though they are pretty extensive and hard to find stuff in there.

Pl45m4

@nekkceb

How do you create your GUI? Any *.ui file involved, where something was changed manually?

I think it's a WindowFlag issue.

The CustomizeWindowHint flag is used to enable customization of the window controls. This flag must be set to allow the WindowTitleHint, WindowSystemMenuHint, WindowMinimizeButtonHint, WindowMaximizeButtonHint and WindowCloseButtonHint flags to be changed.

Qt::WindowContextHelpButtonHint
Adds a context help button to dialogs. On some platforms this implies Qt::WindowSystemMenuHint for it to work.

(from: https://doc.qt.io/qt-6/qt.html#WindowType-enum)

Try

setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowContextHelpButtonHint);

nekkceb

@Pl45m4 Thanks for the hint about hints! I did as you suggest, and now I get the little '?'. Problem solved, but why did I have to do this in Qt 6.6 but not Qt 5.15? Again, for the two builds I use EXACTLY THE SAME SOURCE CODE!

Pl45m4

@nekkceb said in WhatsThis '?' not showing:

Qt 6.6 but not Qt 5.15?

Since the step from 5.15 to 6.6 is pretty huge (a major release + some LTS versions in between), you can't be sure that the same code works the same for both versions.
Defaults could have changed or something else.

That's why upgrading/porting a program from one to another release is often pain in the ass ;-)
Things that have worked, stopped working, changed or even got removed completely.

You could scan the release and patch notes between 5.15 and 6.6 to see if you can find some more information

A good start is always checking (and comparing) both documentation pages.

I use EXACTLY THE SAME SOURCE CODE!

The flags can be set in the *.ui file with QtDesigner. That's why I was asking...

nekkceb

@Pl45m4 Thanks again. I figured in the end it must be a change in default settings. I did make a pretty significant jump from 5.15 to 6.6, though in the end it was relatively straightforward. No super major changes!