The Access Violation while closing Notepad++:
https://github.com/notepad-plus-plus/notepad-plus-plus/issues/3961
could be due to SCN_UPDATEUI sending after NPPN_SHUTDOWN, that makes
plugins treat SCN_UPDATEUI on the released handle.
To avoid such situation, once NPPN_SHUTDOWN has been sent, no more
message will be sent to plugin.
Fixes#3961, fixes#4021
1. Fix shell extension registration error (due to notepad++.exe has not
yet been copied)
2. Fix themes' absence after installation (one variable depends on
its initialization in mainSection)
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'UserDefineDialog' and base class 'StaticDialog'. userdefinedialog.h 332
V762 It is possible a virtual function was overridden incorrectly. See first argument of function 'redraw' in derived class 'SplitterContainer' and base class 'Window'. splittercontainer.h 61
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'FindReplaceDlg' and base class 'StaticDialog'. findreplacedlg.h 245
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'GoToLineDlg' and base class 'StaticDialog'. gotolinedlg.h 45
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'FindCharsInRangeDlg' and base class 'StaticDialog'. findcharsinrange.h 52
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'ColumnEditorDlg' and base class 'StaticDialog'. columneditor.h 45
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'WordStyleDlg' and base class 'StaticDialog'. wordstyledlg.h 77
V762 It is possible a virtual function was overridden incorrectly. See first argument of function 'redraw' in derived class 'WordStyleDlg' and base class 'Window'. wordstyledlg.h 99
V762 It is possible a virtual function was overridden incorrectly. See third argument of function 'create' in derived class 'PluginsAdminDlg' and base class 'StaticDialog'. pluginsadmin.h 100
V746 Object slicing. An exception should be caught by reference rather than by value. filedialog.cpp 183
V746 Object slicing. An exception should be caught by reference rather than by value. nppbigswitch.cpp 110
V746 Object slicing. An exception should be caught by reference rather than by value. pluginsmanager.cpp 259
While install a x64 version, it should remove x86 version if it exists (and vice versa).
The removal feature doesn't work though user answer Yes for the deletion.
This commit fixes this issue.
