Refactoring for reducing the I/O calls, fix typos.
Reduce the startup time (while the a dirty disconnected network file is in the session) from about 12-15 seconds to about 6 seconds (on my laptop).
Note that there are 2 cases are not improved by the commit:
* STR 1: Open a network file, modify it. Disconnect the network, then save the file.
There will be a huge hanging time (around 1 minute) to get the warning dialog.
I tried to remedy with thread for CreateFileW in the constructor of Win32_IO_File, however it leads crash due to the lock guard in the caller.
* STR 2:
1. Open a network file.
2. Close Notepad++ to have it in the session.
3. Disconnect the network, and launch Notepad++ immediately.
4. Around more than 1 minute's delay, then the "Error" dialog displayed.
The reason of hanging is that the network file was detected by "doesFileExist" as true, so Notepad++ was trying to open non-existent file (by _wfopen).
I believe that there's some kind of cache during the very short period for the IO function (here's our case GetFileAttributes), and such cache is not immediately synchronized (cleared) while network disconnected. As a result, when we launch Notepad++ after the disconnection of network, GetFileAttributes keeps its memory & responds "FileExists". However for _wfopen it doesn't see the resource of network anymore - that makes hanging.
Ref #15658
Improve #4306, #6178, #8055, #11388, #12553, #15540Close#15669
Don Ho
a3535f385f