Complete Project state save for Qt Creator

If I close my projects and I reopen them, it does not open the CPP and H files that were open when I closed the project.
Why not fully restore the session? Open the same files that were open, put them in the same order, scroll down to the exact same place and place the caret at the same place. Select the same text that was selected (This one doesn't matter).

You could store the state in the .PRO file or perhaps have a new file with some other extension, such as .SES.
Store the filenames that were opened. the position of the window, the size of the window, the position of the caret, the text that was selected, the z-order of the windows, that project treeview thing that appears to the left side and anything else that the user expands, clicks on and such.

That is something that other IDEs already do, such as VC++6, Visual Studio 2013, 2015, 2017, 2019.