当 ctrl + 左键单击通过 Cygwin X 启动的 QT 应用程序的未聚焦窗口时，我注意到一个非常可重复的段错误。在这一点上，我已经剪掉了所有的应用程序代码，并且在运行一个包含几个空 TextEdits 的简单 QMainWindow 时仍然可以看到相同的行为。一个简单的左键单击未聚焦的窗口（同时按住 ctrl）将导致约 50% 的时间段错误。
有没有人注意到类似的行为？我很好奇，因为我似乎没有在其他地方看到这种行为记录或报告。
注意：我注意到这种行为适用于所有修饰键（alt、ctrl、shift 等）。
#0 0x00007f8429cf614b in ?? () from /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so
#1 0x00007f8429cee501 in ?? () from /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so
#2 0x00007f8429ce9e20 in ?? () from /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so
#3 0x00007f8429ceb0cb in ?? () from /usr/local/lib/qt5/5.0.2/gcc_64/plugins/platforms/libqxcb.so
#4 0x00007f84306c955e in QObject::event(QEvent*) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5
#5 0x00007f84311f25b4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Widgets.so.5
#6 0x00007f84311f5991 in QApplication::notify(QObject*, QEvent*) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Widgets.so.5
#7 0x00007f84306a27c4 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5
#8 0x00007f84306a4701 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5
#9 0x00007f84306ea0d3 in ?? () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5
#10 0x00007f842e7e3f05 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f842e7e4248 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f842e7e4304 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f84306ea514 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5
#14 0x00007f84306a169b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5
#15 0x00007f84306a4c3e in QCoreApplication::exec() () from /usr/local/lib/qt5/5.0.2/gcc_64/lib/libQt5Core.so.5