[ui] fix notification sound when closing using X

* Closes #893

src/rufus.c

@@ -2722,13 +2722,16 @@ static INT_PTR CALLBACK MainCallback(HWND hDlg, UINT message, WPARAM wParam, LPA
 	case WM_CLIENTSHUTDOWN:
 	case WM_QUERYENDSESSION:
 	case WM_ENDSESSION:
-		// TODO: Do we want to use ShutdownBlockReasonCreate() in Vista and later to stop
-		// forced shutdown? See https://msdn.microsoft.com/en-us/library/ms700677.aspx
 		if (format_op_in_progress) {
-			// WM_QUERYENDSESSION uses this value to prevent shutdown
 			return (INT_PTR)TRUE;
 		}
+		if (message == WM_CLOSE) {
+			// We must use PostQuitMessage() on VM_CLOSE, to prevent notification sound...
+			PostQuitMessage(0);
+		} else {
+			// ...but we must simulate Cancel on shutdown requests, else the app freezes.
 			SendMessage(hDlg, WM_COMMAND, (WPARAM)IDCANCEL, (LPARAM)0);
+		}
 		break;
 
 	case UM_PROGRESS_INIT:

src/rufus.rc

@@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 IDD_DIALOG DIALOGEX 12, 12, 242, 376
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
 EXSTYLE WS_EX_ACCEPTFILES
-CAPTION "Rufus 2.12.1056"
+CAPTION "Rufus 2.12.1057"
 FONT 8, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Device",IDS_DEVICE_TXT,9,6,200,8
@@ -334,8 +334,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 2,12,1056,0
- PRODUCTVERSION 2,12,1056,0
+ FILEVERSION 2,12,1057,0
+ PRODUCTVERSION 2,12,1057,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -352,13 +352,13 @@ BEGIN
         BEGIN
             VALUE "CompanyName", "Akeo Consulting (http://akeo.ie)"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "2.12.1056"
+            VALUE "FileVersion", "2.12.1057"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "© 2011-2017 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "http://www.gnu.org/copyleft/gpl.html"
             VALUE "OriginalFilename", "rufus.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "2.12.1056"
+            VALUE "ProductVersion", "2.12.1057"
         END
     END
     BLOCK "VarFileInfo"