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  def styleText(self, start, end): self.startStyling(start) editor = self.parent() #text = editor.text()[start:end] editor.findFirst(NAT.pattern, True, False, False, True) editor.replace('NN') I figured it out by RTFM here: https://www.riverbankcomputing.com/static/Docs/QScintilla/classQsciScintilla.html It does search the whole document, but I don't care since it's written in C++.
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  A couple that I have toyed with (and contributed literally on the order of just "lines", less than 100 lines of code) to: https://subsurface-divelog.org/ https://github.com/mavlink/qgroundcontrol (I was able to use both those projects despite not having diving equipment nor drone equipment. There are ways to run the GUI applications without equipment or with test/simulated inputs.) Others that I have been interested in but never got the time to experiment: KDE Cantor (echoing what @SGaist said about KDE!) https://invent.kde.org/education/cantor Webcamoid https://github.com/webcamoid/webcamoid
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  Thanks for responding. But this was precisely my question! Throwing away an object that is no longer needed is not bad engineering, I would say. But throwing it away somehow screws-up the qt-internals, even when I explicitly disconnect and set the parent to nil. I don't understand. I fear the connect(lineEdit,....) statement somehow puts lineEdit in Qt-s belly where it cannot be undone easily. Furthermore, I made the QLabel instance the parent of the QLineEdit so that Qt take care of deallocation. Instead, I could also create the QLineEdit without setting its parent. In that case I would have a memory leak if I don't delete the object myself. But the memory corruption is still present. Below I post a typical output of valgrind after changing the text and pressing the return key, ==9178== Memcheck, a memory error detector ==9178== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==9178== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info ==9178== Command: ./Linux-5.3/bin/editablelabel ==9178== ==9178== Invalid read of size 8 ==9178== at 0x7E60404: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D05834: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA9DA: QLineEdit::keyPressEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C07C86: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD1126: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C213CC: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7402D31: QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== by 0x73DE33B: QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== Address 0x18a11418 is 8 bytes inside a block of size 248 free'd ==9178== at 0x4C2FBEB: operator delete(void*, unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x7E5470D: QObjectPrivate::deleteChildren() (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C02FF5: QWidget::~QWidget() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA7E8: QLineEdit::~QLineEdit() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x4037D8: MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}::operator()() const (MyWidget.cpp:38) ==9178== by 0x403BB3: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}>::call({lambda()#1}&, void**) (qobjectdefs_impl.h:146) ==9178== by 0x403B94: void QtPrivate::Functor<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0>::call<QtPrivate::List<>, void>({lambda()#1}&, void*, {lambda()#1}&*) (qobjectdefs_impl.h:256) ==9178== by 0x403B63: QtPrivate::QFunctorSlotObject<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:443) ==9178== by 0x7E608B2: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7E608E4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D0582C: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA9DA: QLineEdit::keyPressEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== Block was alloc'd at ==9178== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x6CF840F: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFC130: QLineEdit::QLineEdit(QWidget*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x403830: MyWidget::mousePressEvent(QMouseEvent*) (MyWidget.cpp:19) ==9178== by 0x6C06E1D: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD0D75: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6BCFE42: QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C1E286: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C2135D: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== ==9178== Invalid read of size 1 ==9178== at 0x7E6040C: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D05834: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA9DA: QLineEdit::keyPressEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C07C86: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD1126: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C213CC: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7402D31: QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== by 0x73DE33B: QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== Address 0x147cb380 is 32 bytes inside a block of size 88 free'd ==9178== at 0x4C2FBEB: operator delete(void*, unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x6D071D4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E5470D: QObjectPrivate::deleteChildren() (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C02FF5: QWidget::~QWidget() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA7E8: QLineEdit::~QLineEdit() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x4037D8: MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}::operator()() const (MyWidget.cpp:38) ==9178== by 0x403BB3: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}>::call({lambda()#1}&, void**) (qobjectdefs_impl.h:146) ==9178== by 0x403B94: void QtPrivate::Functor<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0>::call<QtPrivate::List<>, void>({lambda()#1}&, void*, {lambda()#1}&*) (qobjectdefs_impl.h:256) ==9178== by 0x403B63: QtPrivate::QFunctorSlotObject<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:443) ==9178== by 0x7E608B2: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7E608E4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D0582C: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== Block was alloc'd at ==9178== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x7E5F174: QObject::QObject(QObject*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7583182: QInputControl::QInputControl(QInputControl::Type, QObject*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== by 0x6CF841E: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFC130: QLineEdit::QLineEdit(QWidget*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x403830: MyWidget::mousePressEvent(QMouseEvent*) (MyWidget.cpp:19) ==9178== by 0x6C06E1D: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD0D75: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6BCFE42: QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C1E286: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== ==9178== Invalid read of size 8 ==9178== at 0x7E60416: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D05834: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA9DA: QLineEdit::keyPressEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C07C86: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD1126: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C213CC: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7402D31: QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== by 0x73DE33B: QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== Address 0x147cb3a8 is 72 bytes inside a block of size 88 free'd ==9178== at 0x4C2FBEB: operator delete(void*, unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x6D071D4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E5470D: QObjectPrivate::deleteChildren() (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C02FF5: QWidget::~QWidget() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA7E8: QLineEdit::~QLineEdit() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x4037D8: MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}::operator()() const (MyWidget.cpp:38) ==9178== by 0x403BB3: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}>::call({lambda()#1}&, void**) (qobjectdefs_impl.h:146) ==9178== by 0x403B94: void QtPrivate::Functor<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0>::call<QtPrivate::List<>, void>({lambda()#1}&, void*, {lambda()#1}&*) (qobjectdefs_impl.h:256) ==9178== by 0x403B63: QtPrivate::QFunctorSlotObject<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:443) ==9178== by 0x7E608B2: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7E608E4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D0582C: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== Block was alloc'd at ==9178== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x7E5F174: QObject::QObject(QObject*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7583182: QInputControl::QInputControl(QInputControl::Type, QObject*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== by 0x6CF841E: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFC130: QLineEdit::QLineEdit(QWidget*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x403830: MyWidget::mousePressEvent(QMouseEvent*) (MyWidget.cpp:19) ==9178== by 0x6C06E1D: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD0D75: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6BCFE42: QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C1E286: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== ==9178== Invalid read of size 8 ==9178== at 0x7E53B70: QObjectPrivate::maybeSignalConnected(unsigned int) const (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7E60485: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D05834: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA9DA: QLineEdit::keyPressEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C07C86: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD1126: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C213CC: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7402D31: QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== Address 0x147cb3a0 is 64 bytes inside a block of size 88 free'd ==9178== at 0x4C2FBEB: operator delete(void*, unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x6D071D4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E5470D: QObjectPrivate::deleteChildren() (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6C02FF5: QWidget::~QWidget() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFA7E8: QLineEdit::~QLineEdit() (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x4037D8: MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}::operator()() const (MyWidget.cpp:38) ==9178== by 0x403BB3: QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}>::call({lambda()#1}&, void**) (qobjectdefs_impl.h:146) ==9178== by 0x403B94: void QtPrivate::Functor<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0>::call<QtPrivate::List<>, void>({lambda()#1}&, void*, {lambda()#1}&*) (qobjectdefs_impl.h:256) ==9178== by 0x403B63: QtPrivate::QFunctorSlotObject<MyWidget::mousePressEvent(QMouseEvent*)::{lambda()#1}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:443) ==9178== by 0x7E608B2: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7E608E4: ??? (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6D0582C: QWidgetLineControl::processKeyEvent(QKeyEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== Block was alloc'd at ==9178== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9178== by 0x7E5F174: QObject::QObject(QObject*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x7583182: QInputControl::QInputControl(QInputControl::Type, QObject*) (in /usr/local/qt-5.15.2/lib/libQt5Gui.so.5.15.2) ==9178== by 0x6CF841E: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6CFC130: QLineEdit::QLineEdit(QWidget*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x403830: MyWidget::mousePressEvent(QMouseEvent*) (MyWidget.cpp:19) ==9178== by 0x6C06E1D: QWidget::event(QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BCA5BE: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6BD0D75: QApplication::notify(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x7E2C3E9: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt-5.15.2/lib/libQt5Core.so.5.15.2) ==9178== by 0x6BCFE42: QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178== by 0x6C1E286: ??? (in /usr/local/qt-5.15.2/lib/libQt5Widgets.so.5.15.2) ==9178==
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  Pracuję na qt5 (c++) . Wykorzystuję QVideoWidget do odtwarzania strumienia wideo rtsp. Chciałem rysować dowolne sygnatry za pomocą QPainter na wyświetlającym się wideo. Jednak podczas rysowania zasłaniam obraz wideo. Dla przykładu jak obszar rysowania podałem połowę zobrazowania QVideoWidget. Próbowałem dodawać dodatkowy QLabel na QVideoWidget: QLabel *label = new QLabel(ui->videoWidget); i dopiero później rysować po "label", lecz też zasłaniam QVideoWidget. Dodawałem też: ui->videoWidget->setAttribute(Qt::WA_X11OpenGLOverlay ); Lecz wtedy przezroczystość siega aż pulpitu systemu operacyjnego.
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  Duplicate of https://forum.qt.io/topic/124460/qt-wiki-code-formatting