Fix some erroneous `SetFocus()` invocations in dialog procedures:
- In `WM_INITDIALOG`, don't return `TRUE` if focus is changed to a
control, otherwise any focus set by the caller would be ignored;
- In other handlers, `SetFocus()` would generate an inconsistent
behaviour with the dialog push-buttons, as mentioned in:
https://devblogs.microsoft.com/oldnewthing/20040802-00/?p=38283
- The `LogonHandler` notification should be invoked only once for a
given logon operation. It is invoked in `HandleLogon()` after access
to the window station (and desktop) is allowed for the user logging in.
And so, it must not be invoked elsewhere, when no user is logged in
(or a logon failure happened), like after a call to `WlxDisplaySASNotice()`...
- Invoke the `StartShellHandler` notification **before** starting the
shell, and the `PostShellHandler` notification **after** the shell
started.
- Invoke the `LogoffHandler` notification on the application desktop,
just after having terminated all the user's programs, and before
switching back to Winlogon's desktop.
- Add and show the 'Logging off' status message.
- When performing the following actions:
`WLX_SAS_ACTION_LOGOFF`, `WLX_SAS_ACTION_FORCE_LOGOFF`,
as well as:
`WLX_SAS_ACTION_SHUTDOWN`, `WLX_SAS_ACTION_SHUTDOWN_POWER_OFF`,
`WLX_SAS_ACTION_SHUTDOWN_REBOOT`,
ensure that Winlogon is in a correct LogonState for doing the logoff
sequence.
----
Test results for Winlogon notifications, after fix:
- `Asynchronous: FALSE, Impersonation: FALSE`
```
WLEventStartup: 30 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventLogon: 32 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventStartShell: 32 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventPostShell: 32 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventLock: 32 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventUnlock: 32 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventStartScreenSaver: 32 tests executed (0 marked as todo, 6 failures), 0 skipped.
WLEventStopScreenSaver: 32 tests executed (0 marked as todo, 5 failures), 0 skipped.
WLEventLogoff: 32 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventShutdown: 31 tests executed (0 marked as todo, 3 failures), 0 skipped.
```
- `Asynchronous: FALSE, Impersonation: TRUE`
```
WLEventStartup: 30 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventLogon: 33 tests executed (0 marked as todo, 3 failures), 0 skipped.
WLEventStartShell: 33 tests executed (0 marked as todo, 3 failures), 0 skipped.
WLEventPostShell: 33 tests executed (0 marked as todo, 3 failures), 0 skipped.
WLEventLock: 33 tests executed (0 marked as todo, 3 failures), 0 skipped.
WLEventUnlock: 33 tests executed (0 marked as todo, 3 failures), 0 skipped.
WLEventStartScreenSaver: 34 tests executed (0 marked as todo, 3 failures), 0 skipped.
WLEventStopScreenSaver: 34 tests executed (0 marked as todo, 2 failures), 0 skipped.
WLEventLogoff: 34 tests executed (0 marked as todo, 1 failure), 0 skipped.
WLEventShutdown: 31 tests executed (0 marked as todo, 3 failures), 0 skipped.
```
- Replace the winlogon icon by the warning icon.
- Add more space for the main text.
- Move the shutdown time into a separate line to ensure it is always fully visible.
- Add more space for the shutdown message and keep the message empty by default.
- Clean up the resource IDs.
Hermès Bélusca-Maïto