From 4fc35bd506d1fb9d41324d7dd33047c491f2979f Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周三, 08 5月 2024 11:00:38 +0800
Subject: [PATCH] Add mouse hook when exec menu

---
 src/core/contexts/win32windowcontext.cpp |  411 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 379 insertions(+), 32 deletions(-)

diff --git a/src/core/contexts/win32windowcontext.cpp b/src/core/contexts/win32windowcontext.cpp
index ffbcf24..9ad30da 100644
--- a/src/core/contexts/win32windowcontext.cpp
+++ b/src/core/contexts/win32windowcontext.cpp
@@ -33,6 +33,304 @@
 #include "qwkglobal_p.h"
 #include "qwkwindowsextra_p.h"
 
+static QHash<int, const wchar_t *> xmsgHash = //
+    {
+  //
+        {0,    L"WM_NULL"                  },
+        {1,    L"WM_CREATE"                },
+        {2,    L"WM_DESTROY"               },
+        {3,    L"WM_MOVE"                  },
+        {5,    L"WM_SIZE"                  },
+        {6,    L"WM_ACTIVATE"              },
+        {7,    L"WM_SETFOCUS"              },
+        {8,    L"WM_KILLFOCUS"             },
+        {10,   L"WM_ENABLE"                },
+        {11,   L"WM_SETREDRAW"             },
+        {12,   L"WM_SETTEXT"               },
+        {13,   L"WM_GETTEXT"               },
+        {14,   L"WM_GETTEXTLENGTH"         },
+        {15,   L"WM_PAINT"                 },
+        {16,   L"WM_CLOSE"                 },
+        {17,   L"WM_QUERYENDSESSION"       },
+        {18,   L"WM_QUIT"                  },
+        {19,   L"WM_QUERYOPEN"             },
+        {20,   L"WM_ERASEBKGND"            },
+        {21,   L"WM_SYSCOLORCHANGE"        },
+        {22,   L"WM_ENDSESSION"            },
+        {24,   L"WM_SHOWWINDOW"            },
+        {25,   L"WM_CTLCOLOR"              },
+        {26,   L"WM_WININICHANGE"          },
+        {27,   L"WM_DEVMODECHANGE"         },
+        {28,   L"WM_ACTIVATEAPP"           },
+        {29,   L"WM_FONTCHANGE"            },
+        {30,   L"WM_TIMECHANGE"            },
+        {31,   L"WM_CANCELMODE"            },
+        {32,   L"WM_SETCURSOR"             },
+        {33,   L"WM_MOUSEACTIVATE"         },
+        {34,   L"WM_CHILDACTIVATE"         },
+        {35,   L"WM_QUEUESYNC"             },
+        {36,   L"WM_GETMINMAXINFO"         },
+        {38,   L"WM_PAINTICON"             },
+        {39,   L"WM_ICONERASEBKGND"        },
+        {40,   L"WM_NEXTDLGCTL"            },
+        {42,   L"WM_SPOOLERSTATUS"         },
+        {43,   L"WM_DRAWITEM"              },
+        {44,   L"WM_MEASUREITEM"           },
+        {45,   L"WM_DELETEITEM"            },
+        {46,   L"WM_VKEYTOITEM"            },
+        {47,   L"WM_CHARTOITEM"            },
+        {48,   L"WM_SETFONT"               },
+        {49,   L"WM_GETFONT"               },
+        {50,   L"WM_SETHOTKEY"             },
+        {51,   L"WM_GETHOTKEY"             },
+        {55,   L"WM_QUERYDRAGICON"         },
+        {57,   L"WM_COMPAREITEM"           },
+        {61,   L"WM_GETOBJECT"             },
+        {65,   L"WM_COMPACTING"            },
+        {68,   L"WM_COMMNOTIFY"            },
+        {70,   L"WM_WINDOWPOSCHANGING"     },
+        {71,   L"WM_WINDOWPOSCHANGED"      },
+        {72,   L"WM_POWER"                 },
+        {73,   L"WM_COPYGLOBALDATA"        },
+        {74,   L"WM_COPYDATA"              },
+        {75,   L"WM_CANCELJOURNAL"         },
+        {78,   L"WM_NOTIFY"                },
+        {80,   L"WM_INPUTLANGCHANGEREQUEST"},
+        {81,   L"WM_INPUTLANGCHANGE"       },
+        {82,   L"WM_TCARD"                 },
+        {83,   L"WM_HELP"                  },
+        {84,   L"WM_USERCHANGED"           },
+        {85,   L"WM_NOTIFYFORMAT"          },
+        {123,  L"WM_CONTEXTMENU"           },
+        {124,  L"WM_STYLECHANGING"         },
+        {125,  L"WM_STYLECHANGED"          },
+        {126,  L"WM_DISPLAYCHANGE"         },
+        {127,  L"WM_GETICON"               },
+        {128,  L"WM_SETICON"               },
+        {129,  L"WM_NCCREATE"              },
+        {130,  L"WM_NCDESTROY"             },
+        {131,  L"WM_NCCALCSIZE"            },
+        {132,  L"WM_NCHITTEST"             },
+        {133,  L"WM_NCPAINT"               },
+        {134,  L"WM_NCACTIVATE"            },
+        {135,  L"WM_GETDLGCODE"            },
+        {136,  L"WM_SYNCPAINT"             },
+        {160,  L"WM_NCMOUSEMOVE"           },
+        {161,  L"WM_NCLBUTTONDOWN"         },
+        {162,  L"WM_NCLBUTTONUP"           },
+        {163,  L"WM_NCLBUTTONDBLCLK"       },
+        {164,  L"WM_NCRBUTTONDOWN"         },
+        {165,  L"WM_NCRBUTTONUP"           },
+        {166,  L"WM_NCRBUTTONDBLCLK"       },
+        {167,  L"WM_NCMBUTTONDOWN"         },
+        {168,  L"WM_NCMBUTTONUP"           },
+        {169,  L"WM_NCMBUTTONDBLCLK"       },
+        {171,  L"WM_NCXBUTTONDOWN"         },
+        {172,  L"WM_NCXBUTTONUP"           },
+        {173,  L"WM_NCXBUTTONDBLCLK"       },
+        {176,  L"EM_GETSEL"                },
+        {177,  L"EM_SETSEL"                },
+        {178,  L"EM_GETRECT"               },
+        {179,  L"EM_SETRECT"               },
+        {180,  L"EM_SETRECTNP"             },
+        {181,  L"EM_SCROLL"                },
+        {182,  L"EM_LINESCROLL"            },
+        {183,  L"EM_SCROLLCARET"           },
+        {185,  L"EM_GETMODIFY"             },
+        {187,  L"EM_SETMODIFY"             },
+        {188,  L"EM_GETLINECOUNT"          },
+        {189,  L"EM_LINEINDEX"             },
+        {190,  L"EM_SETHANDLE"             },
+        {191,  L"EM_GETHANDLE"             },
+        {192,  L"EM_GETTHUMB"              },
+        {193,  L"EM_LINELENGTH"            },
+        {194,  L"EM_REPLACESEL"            },
+        {195,  L"EM_SETFONT"               },
+        {196,  L"EM_GETLINE"               },
+        {197,  L"EM_LIMITTEXT"             },
+        {197,  L"EM_SETLIMITTEXT"          },
+        {198,  L"EM_CANUNDO"               },
+        {199,  L"EM_UNDO"                  },
+        {200,  L"EM_FMTLINES"              },
+        {201,  L"EM_LINEFROMCHAR"          },
+        {202,  L"EM_SETWORDBREAK"          },
+        {203,  L"EM_SETTABSTOPS"           },
+        {204,  L"EM_SETPASSWORDCHAR"       },
+        {205,  L"EM_EMPTYUNDOBUFFER"       },
+        {206,  L"EM_GETFIRSTVISIBLELINE"   },
+        {207,  L"EM_SETREADONLY"           },
+        {209,  L"EM_SETWORDBREAKPROC"      },
+        {209,  L"EM_GETWORDBREAKPROC"      },
+        {210,  L"EM_GETPASSWORDCHAR"       },
+        {211,  L"EM_SETMARGINS"            },
+        {212,  L"EM_GETMARGINS"            },
+        {213,  L"EM_GETLIMITTEXT"          },
+        {214,  L"EM_POSFROMCHAR"           },
+        {215,  L"EM_CHARFROMPOS"           },
+        {216,  L"EM_SETIMESTATUS"          },
+        {217,  L"EM_GETIMESTATUS"          },
+        {224,  L"SBM_SETPOS"               },
+        {225,  L"SBM_GETPOS"               },
+        {226,  L"SBM_SETRANGE"             },
+        {227,  L"SBM_GETRANGE"             },
+        {228,  L"SBM_ENABLE_ARROWS"        },
+        {230,  L"SBM_SETRANGEREDRAW"       },
+        {233,  L"SBM_SETSCROLLINFO"        },
+        {234,  L"SBM_GETSCROLLINFO"        },
+        {235,  L"SBM_GETSCROLLBARINFO"     },
+        {240,  L"BM_GETCHECK"              },
+        {241,  L"BM_SETCHECK"              },
+        {242,  L"BM_GETSTATE"              },
+        {243,  L"BM_SETSTATE"              },
+        {244,  L"BM_SETSTYLE"              },
+        {245,  L"BM_CLICK"                 },
+        {246,  L"BM_GETIMAGE"              },
+        {247,  L"BM_SETIMAGE"              },
+        {248,  L"BM_SETDONTCLICK"          },
+        {255,  L"WM_INPUT"                 },
+        {256,  L"WM_KEYDOWN"               },
+        {256,  L"WM_KEYFIRST"              },
+        {257,  L"WM_KEYUP"                 },
+        {258,  L"WM_CHAR"                  },
+        {259,  L"WM_DEADCHAR"              },
+        {260,  L"WM_SYSKEYDOWN"            },
+        {261,  L"WM_SYSKEYUP"              },
+        {262,  L"WM_SYSCHAR"               },
+        {263,  L"WM_SYSDEADCHAR"           },
+        {264,  L"WM_KEYLAST"               },
+        {265,  L"WM_UNICHAR"               },
+        {265,  L"WM_WNT_CONVERTREQUESTEX"  },
+        {266,  L"WM_CONVERTREQUEST"        },
+        {267,  L"WM_CONVERTRESULT"         },
+        {268,  L"WM_INTERIM"               },
+        {269,  L"WM_IME_STARTCOMPOSITION"  },
+        {270,  L"WM_IME_ENDCOMPOSITION"    },
+        {271,  L"WM_IME_COMPOSITION"       },
+        {271,  L"WM_IME_KEYLAST"           },
+        {272,  L"WM_INITDIALOG"            },
+        {273,  L"WM_COMMAND"               },
+        {274,  L"WM_SYSCOMMAND"            },
+        {275,  L"WM_TIMER"                 },
+        {276,  L"WM_HSCROLL"               },
+        {277,  L"WM_VSCROLL"               },
+        {278,  L"WM_INITMENU"              },
+        {279,  L"WM_INITMENUPOPUP"         },
+        {280,  L"WM_SYSTIMER"              },
+        {287,  L"WM_MENUSELECT"            },
+        {288,  L"WM_MENUCHAR"              },
+        {289,  L"WM_ENTERIDLE"             },
+        {290,  L"WM_MENURBUTTONUP"         },
+        {291,  L"WM_MENUDRAG"              },
+        {292,  L"WM_MENUGETOBJECT"         },
+        {293,  L"WM_UNINITMENUPOPUP"       },
+        {294,  L"WM_MENUCOMMAND"           },
+        {295,  L"WM_CHANGEUISTATE"         },
+        {296,  L"WM_UPDATEUISTATE"         },
+        {297,  L"WM_QUERYUISTATE"          },
+        {306,  L"WM_CTLCOLORMSGBOX"        },
+        {307,  L"WM_CTLCOLOREDIT"          },
+        {308,  L"WM_CTLCOLORLISTBOX"       },
+        {309,  L"WM_CTLCOLORBTN"           },
+        {310,  L"WM_CTLCOLORDLG"           },
+        {311,  L"WM_CTLCOLORSCROLLBAR"     },
+        {312,  L"WM_CTLCOLORSTATIC"        },
+        {512,  L"WM_MOUSEFIRST"            },
+        {512,  L"WM_MOUSEMOVE"             },
+        {513,  L"WM_LBUTTONDOWN"           },
+        {514,  L"WM_LBUTTONUP"             },
+        {515,  L"WM_LBUTTONDBLCLK"         },
+        {516,  L"WM_RBUTTONDOWN"           },
+        {517,  L"WM_RBUTTONUP"             },
+        {518,  L"WM_RBUTTONDBLCLK"         },
+        {519,  L"WM_MBUTTONDOWN"           },
+        {520,  L"WM_MBUTTONUP"             },
+        {521,  L"WM_MBUTTONDBLCLK"         },
+        {521,  L"WM_MOUSELAST"             },
+        {522,  L"WM_MOUSEWHEEL"            },
+        {523,  L"WM_XBUTTONDOWN"           },
+        {524,  L"WM_XBUTTONUP"             },
+        {525,  L"WM_XBUTTONDBLCLK"         },
+        {528,  L"WM_PARENTNOTIFY"          },
+        {529,  L"WM_ENTERMENULOOP"         },
+        {530,  L"WM_EXITMENULOOP"          },
+        {531,  L"WM_NEXTMENU"              },
+        {532,  L"WM_SIZING"                },
+        {533,  L"WM_CAPTURECHANGED"        },
+        {534,  L"WM_MOVING"                },
+        {536,  L"WM_POWERBROADCAST"        },
+        {537,  L"WM_DEVICECHANGE"          },
+        {544,  L"WM_MDICREATE"             },
+        {545,  L"WM_MDIDESTROY"            },
+        {546,  L"WM_MDIACTIVATE"           },
+        {547,  L"WM_MDIRESTORE"            },
+        {548,  L"WM_MDINEXT"               },
+        {549,  L"WM_MDIMAXIMIZE"           },
+        {550,  L"WM_MDITILE"               },
+        {551,  L"WM_MDICASCADE"            },
+        {552,  L"WM_MDIICONARRANGE"        },
+        {553,  L"WM_MDIGETACTIVE"          },
+        {560,  L"WM_MDISETMENU"            },
+        {561,  L"WM_ENTERSIZEMOVE"         },
+        {562,  L"WM_EXITSIZEMOVE"          },
+        {563,  L"WM_DROPFILES"             },
+        {564,  L"WM_MDIREFRESHMENU"        },
+        {640,  L"WM_IME_REPORT"            },
+        {641,  L"WM_IME_SETCONTEXT"        },
+        {642,  L"WM_IME_NOTIFY"            },
+        {643,  L"WM_IME_CONTROL"           },
+        {644,  L"WM_IME_COMPOSITIONFULL"   },
+        {645,  L"WM_IME_SELECT"            },
+        {646,  L"WM_IME_CHAR"              },
+        {648,  L"WM_IME_REQUEST"           },
+        {656,  L"WM_IMEKEYDOWN"            },
+        {656,  L"WM_IME_KEYDOWN"           },
+        {657,  L"WM_IMEKEYUP"              },
+        {657,  L"WM_IME_KEYUP"             },
+        {672,  L"WM_NCMOUSEHOVER"          },
+        {673,  L"WM_MOUSEHOVER"            },
+        {674,  L"WM_NCMOUSELEAVE"          },
+        {675,  L"WM_MOUSELEAVE"            },
+        {768,  L"WM_CUT"                   },
+        {769,  L"WM_COPY"                  },
+        {770,  L"WM_PASTE"                 },
+        {771,  L"WM_CLEAR"                 },
+        {772,  L"WM_UNDO"                  },
+        {773,  L"WM_RENDERFORMAT"          },
+        {774,  L"WM_RENDERALLFORMATS"      },
+        {775,  L"WM_DESTROYCLIPBOARD"      },
+        {776,  L"WM_DRAWCLIPBOARD"         },
+        {777,  L"WM_PAINTCLIPBOARD"        },
+        {778,  L"WM_VSCROLLCLIPBOARD"      },
+        {779,  L"WM_SIZECLIPBOARD"         },
+        {780,  L"WM_ASKCBFORMATNAME"       },
+        {781,  L"WM_CHANGECBCHAIN"         },
+        {782,  L"WM_HSCROLLCLIPBOARD"      },
+        {783,  L"WM_QUERYNEWPALETTE"       },
+        {784,  L"WM_PALETTEISCHANGING"     },
+        {785,  L"WM_PALETTECHANGED"        },
+        {786,  L"WM_HOTKEY"                },
+        {791,  L"WM_PRINT"                 },
+        {792,  L"WM_PRINTCLIENT"           },
+        {793,  L"WM_APPCOMMAND"            },
+        {856,  L"WM_HANDHELDFIRST"         },
+        {863,  L"WM_HANDHELDLAST"          },
+        {864,  L"WM_AFXFIRST"              },
+        {895,  L"WM_AFXLAST"               },
+        {896,  L"WM_PENWINFIRST"           },
+        {897,  L"WM_RCRESULT"              },
+        {898,  L"WM_HOOKRCRESULT"          },
+        {899,  L"WM_GLOBALRCCHANGE"        },
+        {899,  L"WM_PENMISCINFO"           },
+        {900,  L"WM_SKB"                   },
+        {901,  L"WM_HEDITCTL"              },
+        {901,  L"WM_PENCTL"                },
+        {902,  L"WM_PENMISC"               },
+        {903,  L"WM_CTLINIT"               },
+        {904,  L"WM_PENEVENT"              },
+        {911,  L"WM_PENWINLAST"            },
+        {1024, L"WM_USER"                  },
+};
+
 namespace QWK {
 
     // The thickness of an auto-hide taskbar in pixels.
@@ -888,6 +1186,10 @@
             return false;
         }
 
+        // qDebug().noquote() << QDateTime::currentDateTime()
+        //                    << QString::fromStdWString(xmsgHash.value(message, L"")) << Qt::hex
+        //                    << message;
+
         // Test snap layout
         if (snapLayoutHandler(hWnd, message, wParam, lParam, result)) {
             return true;
@@ -1369,20 +1671,35 @@
                         // how to avoid doing this.
                         // ### FIXME FIXME FIXME
                         *result = ::DefWindowProcW(hWnd, WM_NCMOUSEMOVE, wParam, lParam);
-                    } else if (lastHitTestResultRaw == HTSYSMENU) {
-                        if (message == WM_NCLBUTTONDOWN) {
-                            // A message of WM_SYSCOMMAND with SC_MOUSEMENU will be sent by Windows,
-                            // and the current control flow will be blocked by the menu while
-                            // Windows will create and execute a new event loop until the menu
-                            // returns
-                            iconButtonClickTime = ::GetTickCount64();
-                            *result = ::DefWindowProcW(hWnd, message, wParam, lParam);
-                            iconButtonClickTime = 0;
-                        } else if (message == WM_NCLBUTTONDBLCLK) {
-                            // A message of WM_SYSCOMMAND with SC_CLOSE will be sent by Windows
-                            *result = ::DefWindowProcW(hWnd, message, wParam, lParam);
-                        } else {
-                            *result = FALSE;
+                        emulateClientAreaMessage(hWnd, message, wParam, lParam);
+                        return true;
+                    }
+
+                    if (lastHitTestResultRaw == HTSYSMENU) {
+                        switch (message) {
+                            case WM_NCLBUTTONDOWN:
+                                if (iconButtonClickTime == 0) {
+                                    // A message of WM_SYSCOMMAND with SC_MOUSEMENU will be sent by
+                                    // Windows, and the current control flow will be blocked by the
+                                    // menu while Windows will create and execute a new event loop
+                                    // until the menu returns
+                                    iconButtonClickTime = ::GetTickCount64();
+                                    *result =
+                                        ::DefWindowProcW(hWnd, WM_NCLBUTTONDOWN, wParam, lParam);
+                                    iconButtonClickTime = 0;
+                                } else {
+                                    *result = FALSE;
+                                    emulateClientAreaMessage(hWnd, message, wParam, lParam);
+                                }
+                                break;
+                            case WM_NCLBUTTONDBLCLK:
+                                // A message of WM_SYSCOMMAND with SC_CLOSE will be sent by Windows
+                                *result = ::DefWindowProcW(hWnd, message, wParam, lParam);
+                                break;
+                            default:
+                                *result = FALSE;
+                                emulateClientAreaMessage(hWnd, message, wParam, lParam);
+                                break;
                         }
                     } else {
                         // According to MSDN, we should return non-zero for X button messages to
@@ -1392,8 +1709,8 @@
                             (((message >= WM_NCXBUTTONDOWN) && (message <= WM_NCXBUTTONDBLCLK))
                                  ? TRUE
                                  : FALSE);
+                        emulateClientAreaMessage(hWnd, message, wParam, lParam);
                     }
-                    emulateClientAreaMessage(hWnd, message, wParam, lParam);
                     return true;
                 }
                 break;
@@ -2126,9 +2443,11 @@
                 break;
         }
         if (shouldShowSystemMenu) {
-            bool triggeredByIconButton = iconButtonClickTime > 0;
-            if (triggeredByIconButton) {
-                POINT menuPos{ 0, static_cast<LONG>(getTitleBarHeight(hWnd)) };
+            static HHOOK mouseHook = nullptr;
+            static std::optional<POINT> mouseClickPos;
+            bool mouseHookedLocal = false;
+            if (iconButtonClickTime > 0) {
+                POINT menuPos{0, static_cast<LONG>(getTitleBarHeight(hWnd))};
                 if (const auto tb = titleBar()) {
                     auto titleBarHeight = qreal(m_delegate->mapGeometryToScene(tb).height());
                     titleBarHeight *= m_windowHandle->devicePixelRatio();
@@ -2136,25 +2455,53 @@
                 }
                 ::ClientToScreen(hWnd, &menuPos);
                 nativeGlobalPos = menuPos;
+
+                // Install mouse hook
+                if (!mouseHook) {
+                    mouseHook = ::SetWindowsHookExW(
+                        WH_MOUSE,
+                        [](int nCode, WPARAM wParam, LPARAM lParam) {
+                            if (nCode >= 0) {
+                                if (wParam == WM_LBUTTONDOWN || wParam == WM_LBUTTONDBLCLK) {
+                                    auto pMouseStruct = reinterpret_cast<MOUSEHOOKSTRUCT *>(lParam);
+                                    if (pMouseStruct) {
+                                        mouseClickPos = pMouseStruct->pt;
+                                    }
+                                }
+                            }
+                            return ::CallNextHookEx(nullptr, nCode, wParam, lParam);
+                        },
+                        nullptr, ::GetCurrentThreadId());
+                    mouseHookedLocal = true;
+                }
             }
             bool res = showSystemMenu_sys(hWnd, nativeGlobalPos, broughtByKeyboard,
                                           m_delegate->isHostSizeFixed(m_host));
 
-            // Emulate the Windows SYSMENU button's behavior
-            static uint32_t doubleClickTime = ::GetDoubleClickTime();
-            if (triggeredByIconButton && !res &&
-                ::GetTickCount64() - iconButtonClickTime <= doubleClickTime) {
-                POINT nativeGlobalPos;
-                ::GetCursorPos(&nativeGlobalPos);
-                POINT nativeLocalPos = nativeGlobalPos;
-                ::ScreenToClient(hWnd, &nativeLocalPos);
-                QPoint qtScenePos =
-                    QHighDpi::fromNativeLocalPosition(point2qpoint(nativeLocalPos), m_windowHandle);
-                WindowAgentBase::SystemButton sysButtonType = WindowAgentBase::Unknown;
-                if (isInSystemButtons(qtScenePos, &sysButtonType) &&
-                    sysButtonType == WindowAgentBase::WindowIcon) {
-                    ::PostMessageW(hWnd, WM_SYSCOMMAND, SC_CLOSE, 0);
+            // Uninstall mouse hook and check if it's a double-click
+            if (mouseHookedLocal) {
+                ::UnhookWindowsHookEx(mouseHook);
+
+                // Emulate the Windows icon button's behavior
+                static uint32_t doubleClickTime = ::GetDoubleClickTime();
+                if (!res && mouseClickPos.has_value() &&
+                    ::GetTickCount64() - iconButtonClickTime <= doubleClickTime) {
+                    POINT nativeGlobalPos;
+                    ::GetCursorPos(&nativeGlobalPos);
+                    POINT nativeLocalPos = mouseClickPos.value();
+                    // qDebug() << point2qpoint(nativeLocalPos) << point2qpoint(nativeGlobalPos);
+                    ::ScreenToClient(hWnd, &nativeLocalPos);
+                    QPoint qtScenePos = QHighDpi::fromNativeLocalPosition(
+                        point2qpoint(nativeLocalPos), m_windowHandle);
+                    WindowAgentBase::SystemButton sysButtonType = WindowAgentBase::Unknown;
+                    if (isInSystemButtons(qtScenePos, &sysButtonType) &&
+                        sysButtonType == WindowAgentBase::WindowIcon) {
+                        ::PostMessageW(hWnd, WM_SYSCOMMAND, SC_CLOSE, 0);
+                    }
                 }
+
+                mouseHook = nullptr;
+                mouseClickPos.reset();
             }
 
             // QPA's internal code will handle system menu events separately, and its

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