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Quickly when coding the GUI, I realized that a window manager was needed. The number one issue is taking into account the overlap of the windows. I display a window A, and then I display a window B on top: what happens to the part covered ?
Second issue, if I reduce the window B, I have to erase it, so you have to save it somewhere else. Also if there is background processing in this window, this one must be updated (including if it is minimized).
And then we have to restore the area that was covered by window B.
I explain to you how I did : here
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