After completing Edit->Alignment, main window remains small instead of
maximized. It looks like this is Qt 6 regression as the automatic
maximization behavior was somehow changed. Previously it didn't need
explicit handling to restore the maximisation.
So, this patch preserves the previous window state before entering
Alignment editor and restores window being maximized/minimized or normal
upon finishing the operation.
* missing includes in Base, App and Gui headers
header should be self contained
* use cstddef header instead of stddef.h
Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>
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Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>
