I managed to the break points working from with the QT-creator IDE
https://sourceforge.net/apps/phpbb/free-cad/viewtopic.php?f=10&t=2237
I set the breakpoint on void ViewProviderSketch::draw(bool temp) and I was looking at the call stack after I clicked the mouse
0 SketcherGui::ViewProviderSketch::draw ViewProviderSketch.cpp 1600 0x00007fffd1d4453a
1 SketcherGui::ViewProviderSketch::updateData ViewProviderSketch.cpp 2639 0x00007fffd1d5045e
2 Gui::ViewProvider::update ViewProvider.cpp 232 0x00007ffff748391c
3 Gui::Document::slotChangedObject Document.cpp 434 0x00007ffff72242fe
4 boost::_mfi::mf2<void, Gui::Document, App::DocumentObject const&, App::Property const&>::operator()(Gui::Document*, App::DocumentObject const&, App::Property const&) const /home/jonas/freecad/free-cad/lib/libFreeCADGui.so 0 0x00007ffff7233826
5 void boost::_bi::list3<boost::_bi::value<Gui::Document*>, boost::arg<1>, boost::arg<2> >::operator()<boost::_mfi::mf2<void, Gui::Document, App::DocumentObject const&, App::Property const&>, boost::_bi::list2<App::DocumentObject const&, App::Property const&> >(boost::_bi::type<void>, boost::_mfi::mf2<void, Gui::Document, App::DocumentObject const&, App::Property const&>&, boost::_bi::list2<App::DocumentObject const&, App::Property const&>&, int) /home/jonas/freecad/free-cad/lib/libFreeCADGui.so 0 0x00007ffff7232cc8
6 void boost::_bi::bind_t<void, boost::_mfi::mf2<void, Gui::Document, App::DocumentObject const&, App::Property const&>, boost::_bi::list3<boost::_bi::value<Gui::Document*>, boost::arg<1>, boost::arg<2> > >::operator()<App::DocumentObject, App::Property>(App::DocumentObject const&, App::Property const&) /home/jonas/freecad/free-cad/lib/libFreeCADGui.so 0 0x00007ffff723214e
7 boost::detail::function::void_function_obj_invoker2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, Gui::Document, App::DocumentObject const&, App::Property const&>, boost::_bi::list3<boost::_bi::value<Gui::Document*>, boost::arg<1>, boost::arg<2> > >, void, App::DocumentObject const&, App::Property const&>::invoke(boost::detail::function::function_buffer&, App::DocumentObject const&, App::Property const&) /home/jonas/freecad/free-cad/lib/libFreeCADGui.so 0 0x00007ffff723131b
8 boost::function2<void, App::DocumentObject const&, App::Property const&>::operator() function_template.hpp 1013 0x00007ffff6b1efce
9 boost::signals::detail::unusable boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >::operator()<boost::signals::detail::connection_slot_pair>(boost::signals::detail::connection_slot_pair const&) const signal_template.hpp 119 0x00007ffff6b1d95d
10 boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>::dereference() const slot_call_iterator.hpp 61 0x00007ffff6b1c0c4
11 boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>::reference boost::iterator_core_access::dereference<boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator> >(boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator> const&) iterator_facade.hpp 517 0x00007ffff6b1a7a6
12 boost::iterator_facade<boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>, boost::signals::detail::unusable, boost::single_pass_traversal_tag, boost::signals::detail::unusable const&, long>::operator*() const iterator_facade.hpp 643 0x00007ffff6b17c06
13 postfix_increment_proxy iterator_facade.hpp 145 0x00007ffff6b1416c
14 boost::detail::postfix_increment_result<boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>, boost::signals::detail::unusable, boost::signals::detail::unusable const&, boost::single_pass_traversal_tag>::type boost::operator++<boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>, boost::signals::detail::unusable, boost::single_pass_traversal_tag, boost::signals::detail::unusable const&, long>(boost::iterator_facade<boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>, boost::signals::detail::unusable, boost::single_pass_traversal_tag, boost::signals::detail::unusable const&, long>&, int) iterator_facade.hpp 732 0x00007ffff6b1042c
15 void boost::last_value<void>::operator()<boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator> >(boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>, boost::signals::detail::slot_call_iterator<boost::signals::detail::call_bound2<void>::caller<App::DocumentObject const&, App::Property const&, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >, boost::signals::detail::named_slot_map_iterator>) const last_value.hpp 49 0x00007ffff6b0c329
16 boost::signal2<void, App::DocumentObject const&, App::Property const&, boost::last_value<void>, int, std::less<int>, boost::function<void ()(App::DocumentObject const&, App::Property const&)> >::operator()(App::DocumentObject const&, App::Property const&) signal_template.hpp 354 0x00007ffff6b08a05
17 App::Document::onChangedProperty Document.cpp 432 0x00007ffff6afaaf7
18 App::DocumentObject::onChanged DocumentObject.cpp 186 0x00007ffff6b21c88
19 Part::Feature::onChanged PartFeature.cpp 112 0x00007fffd0ff9b5a
20 Sketcher::SketchObject::onChanged SketchObject.cpp 1431 0x00007fffd19447a2
21 App::Property::hasSetValue Property.cpp 94 0x00007ffff6b61e5f
22 Part::PropertyGeometryList::setValues PropertyGeometryList.cpp 103 0x00007fffd1016335
23 Sketcher::SketchObject::addGeometry SketchObject.cpp 296 0x00007fffd193d5dc
24 Sketcher::SketchObjectPy::addGeometry SketchObjectPyImp.cpp 65 0x00007fffd19cc55b
25 Sketcher::SketchObjectPy::staticCallback_addGeometry SketchObjectPy.cpp 272 0x00007fffd19c8823
26 PyEval_EvalFrameEx /usr/lib/libpython2.6.so.1.0 0 0x00007ffff620a030
27 PyEval_EvalCodeEx /usr/lib/libpython2.6.so.1.0 0 0x00007ffff620bd60
28 PyEval_EvalCode /usr/lib/libpython2.6.so.1.0 0 0x00007ffff620be32
29 PyRun_StringFlags /usr/lib/libpython2.6.so.1.0 0 0x00007ffff6229d1c
30 Base::InterpreterSingleton::runString Interpreter.cpp 117 0x00007ffff66dc653
31 Gui::Command::doCommand Command.cpp 413 0x00007ffff72635b3
32 DrawSketchHandlerLineSet::releaseButton CommandCreateGeo.cpp 563 0x00007fffd1d12316
33 SketcherGui::ViewProviderSketch::mouseButtonPressed ViewProviderSketch.cpp 581 0x00007fffd1d3cfa8
34 Gui::ViewProvider::eventCallback ViewProvider.cpp 195 0x00007ffff74835ce
35 SoEventCallback::handleEvent(SoHandleEventAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4eb3e0b
36 SoNode::handleEventS(SoAction*, SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4eccda7
37 SoAction::traverse(SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4c944f7
38 SoChildList::traverse(SoAction*, int, int) /usr/lib/libCoin.so.60 0 0x00007ffff4de8ded
39 SoGroup::doAction(SoAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4ebffbb
40 SoSeparator::doAction(SoAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4ee393f
41 Gui::SoFCUnifiedSelection::handleEvent SoFCUnifiedSelection.cpp 322 0x00007ffff73db639
42 SoNode::handleEventS(SoAction*, SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4eccda7
43 SoAction::traverse(SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4c944f7
44 SoChildList::traverse(SoAction*, int, int) /usr/lib/libCoin.so.60 0 0x00007ffff4de8ded
45 SoGroup::doAction(SoAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4ebffbb
46 SoSeparator::doAction(SoAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4ee393f
47 SoNode::handleEventS(SoAction*, SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4eccda7
48 SoAction::traverse(SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4c944f7
49 SoChildList::traverse(SoAction*, int, int) /usr/lib/libCoin.so.60 0 0x00007ffff4de8ded
50 SoGroup::doAction(SoAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4ebffbb
51 SoSeparator::doAction(SoAction*) /usr/lib/libCoin.so.60 0 0x00007ffff4ee393f
52 SoNode::handleEventS(SoAction*, SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4eccda7
53 SoAction::traverse(SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4c944f7
54 SoHandleEventAction::beginTraversal(SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4c9f91a
55 SoAction::apply(SoNode*) /usr/lib/libCoin.so.60 0 0x00007ffff4c94b72
56 SoEventManager::actuallyProcessEvent(SoEvent const*) /usr/lib/libCoin.so.60 0 0x00007ffff4e742d9
57 SoQtRenderArea::processSoEvent(SoEvent const*) /usr/lib/libSoQt4.so.20 0 0x00007ffff47b5efe
58 SoQtViewer::processSoEvent(SoEvent const*) /usr/lib/libSoQt4.so.20 0 0x00007ffff47ee1bb
59 Gui::View3DInventorViewer::processSoEventBase View3DInventorViewer.cpp 1111 0x00007ffff7463b89
60 Gui::NavigationStyle::processSoEvent NavigationStyle.cpp 1086 0x00007ffff74497f3
61 Gui::CADNavigationStyle::processSoEvent CADNavigationStyle.cpp 445 0x00007ffff744df44
62 Gui::NavigationStyle::processEvent NavigationStyle.cpp 1069 0x00007ffff7449746
63 Gui::View3DInventorViewer::processSoEvent View3DInventorViewer.cpp 1106 0x00007ffff7463b5f
64 SoQtRenderArea::processEvent(QEvent*) /usr/lib/libSoQt4.so.20 0 0x00007ffff47b9329
65 Gui::View3DInventorViewer::processEvent View3DInventorViewer.cpp 1045 0x00007ffff746366d
66 SoQtGLWidgetP::eventFilter(QObject*, QEvent*) /usr/lib/libSoQt4.so.20 0 0x00007ffff47b2a8f
67 QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) /usr/lib/libQtCore.so.4 0 0x00007ffff12cf487
68 QApplicationPrivate::notify_helper(QObject*, QEvent*) /usr/lib/libQtGui.so.4 0 0x00007ffff238c1fc
69 QApplication::notify(QObject*, QEvent*) /usr/lib/libQtGui.so.4 0 0x00007ffff2392ecb
70 Gui::GUIApplication::notify Application.cpp 1444 0x00007ffff7204c05
71 QCoreApplication::notifyInternal(QObject*, QEvent*) /usr/lib/libQtCore.so.4 0 0x00007ffff12d006c
72 QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) /usr/lib/libQtGui.so.4 0 0x00007ffff23920ae
73 ?? /usr/lib/libQtGui.so.4 0 0x00007ffff2411f65
74 QApplication::x11ProcessEvent(_XEvent*) /usr/lib/libQtGui.so.4 0 0x00007ffff24108ac
75 ?? /usr/lib/libQtGui.so.4 0 0x00007ffff243c882
76 g_main_context_dispatch /lib/libglib-2.0.so.0 0 0x00007fffeb58e8c2
77 ?? /lib/libglib-2.0.so.0 0 0x00007fffeb592748
78 g_main_context_iteration /lib/libglib-2.0.so.0 0 0x00007fffeb5928fc
79 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) /usr/lib/libQtCore.so.4 0 0x00007ffff12f9513
80 ?? /usr/lib/libQtGui.so.4 0 0x00007ffff243c46e
81 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) /usr/lib/libQtCore.so.4 0 0x00007ffff12ce992
82 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) /usr/lib/libQtCore.so.4 0 0x00007ffff12ced6c
83 QCoreApplication::exec() /usr/lib/libQtCore.so.4 0 0x00007ffff12d2aab
84 Gui::Application::runApplication Application.cpp 1660 0x00007ffff7200fc7
85 main MainGui.cpp 349 0x00000000004078e4
I think level 34 looks interesting. I need to put the break point on Gui::ViewProvider::eventCallback ViewProvider.cpp and single step my way to see whats going on. But that’s enough for tonight.