Window resizing

[Duane Clark <dclark@akamail.com>]

When resizing a client window, a WM_SYSCOMMAND message is sent with a 
value in wParam indicating which border or corner is being sized. All 
the MSDN says (as far as I can see) about the value to use is "In 
WM_SYSCOMMAND messages, the four low-order bits of the wParam parameter 
are used internally by the system."

So at some point it was apparently decided to arbitrarily pick an 
encoding. The encoding used was SC_SIZE + wParam - 2. However, Visual 
FoxPro handles the generation of WM_SYSCOMMAND messages itself, and uses 
a different value. Testing with SPY++ under WinNT shows that when WinNT 
sends the message, it encodes wParam as 
SC_SIZE+wParam-(HTLEFT-WMSZ_LEFT). And this matches what Visual FoxPro 
generates, so that looks like the correct value to use.

Changelog:
	Correctly encode wParam for WM_SYSCOMMAND messages.

Index: dlls/x11drv/winpos.c
===================================================================
RCS file: /home/wine/wine/dlls/x11drv/winpos.c,v
retrieving revision 1.63
diff -u -r1.63 winpos.c
--- dlls/x11drv/winpos.c	8 Jan 2003 21:09:26 -0000	1.63
+++ dlls/x11drv/winpos.c	8 Feb 2003 22:44:11 -0000
@@ -1901,7 +1903,8 @@
     else  /* SC_SIZE */
     {
         if (!thickframe) return;
-        if ( hittest && hittest != HTSYSMENU ) hittest += 2;
+        if ( hittest && ((wParam & 0xfff0) != SC_MOUSEMENU) )
+            hittest += (HTLEFT - WMSZ_LEFT);
         else
         {
             set_movesize_capture( hwnd );
Index: windows/nonclient.c
===================================================================
RCS file: /home/wine/wine/windows/nonclient.c,v
retrieving revision 1.109
diff -u -r1.109 nonclient.c
--- windows/nonclient.c	14 Jan 2003 23:41:01 -0000	1.109
+++ windows/nonclient.c	8 Feb 2003 22:44:12 -0000
@@ -2071,8 +2071,15 @@
     case HTBOTTOM:
     case HTBOTTOMLEFT:
     case HTBOTTOMRIGHT:
-	/* make sure hittest fits into 0xf and doesn't overlap with HTSYSMENU */
-	SendMessageW( hwnd, WM_SYSCOMMAND, SC_SIZE + wParam - 2, lParam);
+        /* Old comment:
+         * "make sure hittest fits into 0xf and doesn't overlap with HTSYSMENU"
+         * This was previously done by setting wParam=SC_SIZE + wParam - 2
+         */
+        /* But that is not what WinNT does. Instead it sends this. This
+         * is easy to differentiate from HTSYSMENU, because HTSYSMENU adds
+         * SC_MOUSEMENU into wParam.
+         */
+        SendMessageW( hwnd, WM_SYSCOMMAND, SC_SIZE + wParam - (HTLEFT-WMSZ_LEFT), lParam);
 	break;
 
     case HTBORDER: