Simplify Win32 character message handling

src/win32_window.c

@@ -317,43 +317,34 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
             return 0;
         }
 
-        case WM_KEYDOWN:
-        case WM_SYSKEYDOWN:
-        {
-            const int scancode = (lParam >> 16) & 0x1ff;
-            const int key = translateKey(wParam, lParam);
-            if (key == _GLFW_KEY_INVALID)
-                break;
-
-            _glfwInputKey(window, key, scancode, GLFW_PRESS, getKeyMods());
-            break;
-        }
-
         case WM_CHAR:
-        {
-            _glfwInputChar(window, (unsigned int) wParam, getKeyMods(), GLFW_TRUE);
-            return 0;
-        }
-
         case WM_SYSCHAR:
-        {
-            _glfwInputChar(window, (unsigned int) wParam, getKeyMods(), GLFW_FALSE);
-            return 0;
-        }
-
         case WM_UNICHAR:
         {
-            // This message is not sent by Windows, but is sent by some
-            // third-party input method engines
+            const GLFWbool plain = (uMsg != WM_SYSCHAR);
 
-            if (wParam == UNICODE_NOCHAR)
+            if (uMsg == WM_UNICHAR && wParam == UNICODE_NOCHAR)
             {
+                // WM_UNICHAR is not sent by Windows, but is sent by some
+                // third-party input method engine
                 // Returning TRUE here announces support for this message
                 return TRUE;
             }
 
-            _glfwInputChar(window, (unsigned int) wParam, getKeyMods(), GLFW_TRUE);
-            return FALSE;
+            _glfwInputChar(window, (unsigned int) wParam, getKeyMods(), plain);
+            return 0;
+        }
+
+        case WM_KEYDOWN:
+        case WM_SYSKEYDOWN:
+        {
+            const int scancode = (lParam >> 16) & 0x1ff;
+            const int key = translateKey(wParam, lParam);
+            if (key == _GLFW_KEY_INVALID)
+                break;
+
+            _glfwInputKey(window, key, scancode, GLFW_PRESS, getKeyMods());
+            break;
         }
 
         case WM_KEYUP: