Update.

Signed-off-by: Yuhang Zhao <2546789017@qq.com>

winnativeeventfilter.cpp

@@ -473,48 +473,44 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
                 }
                 return HTCLIENT;
             }
-            if (_data->windowData.fixedSize) {
-                if (isTitlebar) {
-                    return HTCAPTION;
-                } else {
-                    // Un-resizeable border.
-                    return HTBORDER;
-                }
-            } else {
             const bool isTop = isInsideWindow && (mouse.y < bh);
             const bool isBottom = isInsideWindow && (mouse.y > (wh - bh));
             // Make the border wider to let the user easy to resize on corners.
             const int factor = (isTop || isBottom) ? 2 : 1;
             const bool isLeft = isInsideWindow && (mouse.x < (bw * factor));
             const bool isRight = isInsideWindow && (mouse.x > (ww - (bw * factor)));
+            const bool fixedSize = _data->windowData.fixedSize;
+            const auto getBorderValue = [fixedSize](int value) -> int {
+                // HTBORDER: un-resizeable window border.
+                return fixedSize ? HTBORDER : value;
+            };
             if (isTop) {
                 if (isLeft) {
-                        return HTTOPLEFT;
+                    return getBorderValue(HTTOPLEFT);
                 }
                 if (isRight) {
-                        return HTTOPRIGHT;
+                    return getBorderValue(HTTOPRIGHT);
                 }
-                    return HTTOP;
+                return getBorderValue(HTTOP);
             }
             if (isBottom) {
                 if (isLeft) {
-                        return HTBOTTOMLEFT;
+                    return getBorderValue(HTBOTTOMLEFT);
                 }
                 if (isRight) {
-                        return HTBOTTOMRIGHT;
+                    return getBorderValue(HTBOTTOMRIGHT);
                 }
-                    return HTBOTTOM;
+                return getBorderValue(HTBOTTOM);
             }
             if (isLeft) {
-                    return HTLEFT;
+                return getBorderValue(HTLEFT);
             }
             if (isRight) {
-                    return HTRIGHT;
+                return getBorderValue(HTRIGHT);
             }
             if (isTitlebar) {
                 return HTCAPTION;
             }
-            }
             return HTCLIENT;
         };
         *result = getHTResult(msg->hwnd, msg->lParam, data);