Fix Notepad++ blocked when closed minimized or from systray

When Notepad++ is minimized and there are 2 or more unsaved opened files,
close Notepad++ directly from the taskbar (no periodic backup) will launch modal Save All dialog,
which will not be on the foreground. Hence the blocage of Notepad++.

This commit fixes the issue above.

Fix #14718, close #14725

PowerEditor/src/Notepad_plus.cpp

@@ -2449,7 +2449,13 @@ int Notepad_plus::doSaveOrNot(const TCHAR* fn, bool isMulti)
 	if ((NppParameters::getInstance()).isEndSessionCritical())
 		return IDCANCEL; // simulate Esc-key or Cancel-button as there should not be any big delay / code-flow block
 
-	// In case Notepad++ is iconized into notification zone
+	// In case Notepad++ is minimized into taskbar or iconized into notification zone
+	if (::IsIconic(_pPublicInterface->getHSelf()))
+	{
+		::ShowWindow(_pPublicInterface->getHSelf(), SW_RESTORE);
+	}
+	else
+	{
 		if (!::IsWindowVisible(_pPublicInterface->getHSelf()))
 		{
 			::ShowWindow(_pPublicInterface->getHSelf(), SW_SHOW);
@@ -2457,6 +2463,7 @@ int Notepad_plus::doSaveOrNot(const TCHAR* fn, bool isMulti)
 			// Send sizing info to make window fit (specially to show tool bar.)
 			::SendMessage(_pPublicInterface->getHSelf(), WM_SIZE, 0, 0);
 		}
+	}
 
 	if (!isMulti)
 	{

PowerEditor/src/WinControls/StaticDialog/StaticDialog.cpp

@@ -79,10 +79,15 @@ void StaticDialog::goToCenter(UINT swpFlags)
 {
 	RECT rc{};
 	::GetClientRect(_hParent, &rc);
+	if ((rc.left == rc.right) || (rc.top == rc.bottom))
+		swpFlags |= SWP_NOSIZE; // sizing has no sense here
+
 	POINT center{};
 	center.x = rc.left + (rc.right - rc.left)/2;
 	center.y = rc.top + (rc.bottom - rc.top)/2;
 	::ClientToScreen(_hParent, &center);
+	if ((center.x == -32000) && (center.y == -32000)) // https://devblogs.microsoft.com/oldnewthing/20041028-00/?p=37453
+		swpFlags |= SWP_NOMOVE; // moving has no sense here (owner wnd is minimized)
 
 	int x = center.x - (_rc.right - _rc.left)/2;
 	int y = center.y - (_rc.bottom - _rc.top)/2;