Merged in cwalther/cwe/window-cursor (pull request #25)

Free the cursor, update

Updates to pull request #21 by Hoikas that fix the issue that quick mouse moves while walking/looking by mouse could get the cursor out of the window and break the continuous turning.

From H-uru PR #221 "Window fixes".

MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/Apps/plClient/winmain.cpp

@@ -433,35 +433,43 @@ void DebugMsgF(const char* format, ...);
 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {	
 	static bool gDragging = false;
-	static UInt32 keyState=0;
+	static UInt8 mouse_down = 0;
 
     // Handle messages
     switch (message) {		
-		case WM_KEYDOWN :
-		case WM_LBUTTONDOWN	:
-		case WM_RBUTTONDOWN :
-		case WM_LBUTTONDBLCLK :		// The left mouse button was double-clicked. 
-		case WM_MBUTTONDBLCLK :		// The middle mouse button was double-clicked. 
-		case WM_MBUTTONDOWN :		// The middle mouse button was pressed. 
-		case WM_RBUTTONDBLCLK :		// The right mouse button was double-clicked. 
+		case WM_LBUTTONDOWN:
+		case WM_RBUTTONDOWN:
+		case WM_LBUTTONDBLCLK:
+		case WM_MBUTTONDBLCLK:
+		case WM_MBUTTONDOWN:
+		case WM_RBUTTONDBLCLK:
+			// Ensure we don't leave the client area during clicks
+			if (!(mouse_down++))
+				SetCapture(hWnd);
+			// fall through to old case
+		case WM_KEYDOWN:
 			// If they did anything but move the mouse, quit any intro movie playing.
+			if (gClient)
 			{
-				if( gClient )
-					gClient->SetQuitIntro(true);
-			}
-			// Fall through to other events
-		case WM_KEYUP :
-		case WM_LBUTTONUP :
-		case WM_RBUTTONUP :
-		case WM_MBUTTONUP :			// The middle mouse button was released. 
-		case 0x020A:				// fuc&ing windows b.s...
-			{
-				if (gClient && gClient->WindowActive() && gClient->GetInputManager())
-				{
+				gClient->SetQuitIntro(true);
+
+				// normal input processing
+				if (gClient->WindowActive() && gClient->GetInputManager())
 					gClient->GetInputManager()->HandleWin32ControlEvent(message, wParam, lParam, hWnd);
-				}
 			}
 			break;
+		case WM_LBUTTONUP:
+		case WM_RBUTTONUP:
+		case WM_MBUTTONUP:
+			// Stop hogging the cursor
+			if (!(--mouse_down))
+				ReleaseCapture();
+			// fall through to input processing
+		case WM_MOUSEWHEEL:
+		case WM_KEYUP:
+		   if (gClient && gClient->WindowActive() && gClient->GetInputManager())
+			   gClient->GetInputManager()->HandleWin32ControlEvent(message, wParam, lParam, hWnd);
+			break;
 
 		case WM_MOUSEMOVE:
 			{