Track mouse ups/downs for releasing purposes

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

@@ -432,7 +432,7 @@ 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) {		
@@ -442,8 +442,9 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 		case WM_MBUTTONDBLCLK:
 		case WM_MBUTTONDOWN:
 		case WM_RBUTTONDBLCLK:
-			// Ensure we don't leave the client area during this action
+			// Ensure we don't leave the client area during clicks
-			SetCapture(hWnd);
+			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.
@@ -460,7 +461,8 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 		case WM_RBUTTONUP:
 		case WM_MBUTTONUP:
 			// Stop hogging the cursor
-			ReleaseCapture();
+			if (!(--mouse_down))
+				ReleaseCapture();
 			// fall through to input processing
 		case WM_MOUSEWHEEL:
 		case WM_KEYUP: