Qt windowflags in Linux - c++

Image of the main application and child application
Im using Linux Ubuntu 16.04 and Qt Application
I have a problem about a windowflags in qt, that when I enter in full screen mode, my application model bar and menu bar hides since my application opens 2 application.
So I decided to make another application to Qt::FramelessWindowhint in order the other application cannot be open and only the main application will be shown.
My problem is when I dragged the application to another monitor, the 2nd application will hide.
Can anyone help me about this problem?

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It is a matter of window manager and of desktop environment. Both are provided by (very broadly speaking) your "operating system" and are not tied to one particular process using Qt.
The system tray belongs to the desktop environment. A particular process using Qt has no reason to minimize it. The minimization of the system tray is the business of the desktop environment (not of one particular Qt application). I see no reason why your application would do that (remember that your user could also run other applications, which are even more important to him than yours and which also interact with or require using the system tray).
Of course, Qt provides an API to interact with the window manager and the desktop environment.
PS. On Linux, the convention between a Qt application and the window manager or desktop environment are documented in EWMH and ICCCM. You need to find the equivalent for Windows. I never used Windows so I don't know them. On Linux, one can code a window manager using Qt.

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