Fix recursive paint on Experimental timeline by adding repaint_after_…

[jonoomph]

Fix recursive paint on Experimental timeline by adding repaint_after_paint.

Crash this fixes:

DEBUG preview_thread: Max timeline length/frames detected: 8227
DEBUG preview_thread: refreshFrame
DEBUG preview_thread: refreshFrame
[swscaler @ 00000229579c6bc0] Warning: data is not aligned! This can lead to a speed loss
QPaintDevice: Cannot destroy paint device that is being painted
QWidget::repaint: Recursive repaint detected
Caught signal 11 (SIGSEGV)
---- Unhandled Exception: Stack Trace ----
[3] _C_specific_handler, address 0x131FBD10
[4] _chkstk, address 0x13F260F0
[5] RtlLocateExtendedFeature, address 0x13DD1D90
[6] KiUserExceptionDispatcher, address 0x13F25AA0
[7] ZN8QPainter3endEv, address 0x45A418C0
[8] PyInit_QtGui, address 0xF010ADE0
[9] PyLong_FromUnsignedLong, address 0xD4B3F890
[10] PyObject_MakeTpCall, address 0xD4B2B9E0
[11] PyEval_EvalFrameDefault, address 0xD4B20A00
[12] PyEval_EvalCodeWithName, address 0xD4B1CBD0
[13] PyFunction_Vectorcall, address 0xD4B30770
[14] PyMethod_New, address 0xD4B3C0C0
[15] PyVectorcall_Call, address 0xD4B3C590
[16] ???
[17] ???
[18] ???
[19] PyInit_QtWidgets, address 0xF03CECA0
[20] ZN7QWidget5eventEP6QEvent, address 0xF5AC7200
[21] PyInit_QtWidgets, address 0xF03CECA0
[22] ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent, address 0xF5A87F50
[23] PyInit_QtWidgets, address 0xF03CECA0
[24] ZN16QCoreApplication20sendSpontaneousEventEP7QObjectP6QEvent, address 0xF6235200
[25] ZN14QWidgetPrivate14sendPaintEventERK7QRegion, address 0xF5ABFED0
[26] ZN14QWidgetPrivate10drawWidgetEP12QPaintDeviceRK7QRegionRK6QPoint6QFlagsINS_14DrawWidgetFlagEEP8QPainterP21QWidgetRepaintManager, address 0xF5ABFF40
[27] ZNK14QWidgetPrivate24shouldDiscardSyncRequestEv, address 0xF5A93C90
[28] ZN7QWidget5eventEP6QEvent, address 0xF5AC7200
[29] PyInit_QtWidgets, address 0xF03CECA0
[30] ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent, address 0xF5A87F50
[31] PyInit_QtWidgets, address 0xF03CECA0
[32] ZN16QCoreApplication9sendEventEP7QObjectP6QEvent, address 0xF6235010
[33] ZNK14QWidgetPrivate24shouldDiscardSyncRequestEv, address 0xF5A93C90
[34] ZN12QPixmapStyle11qt_metacallEN11QMetaObject4CallEiPPv, address 0xF5DFAB20
[35] ZThn16_NK7QWidget13sharedPainterEv, address 0xF5AAC2A0
[36] ZN7QWidget7repaintEv, address 0xF5AB23B0
[37] PyInit_QtWidgets, address 0xF03CECA0
[38] PyLong_FromUnsignedLong, address 0xD4B3F890
[39] PyObject_MakeTpCall, address 0xD4B2B9E0
[40] PyEval_EvalFrameDefault, address 0xD4B20A00
[41] PyCell_New, address 0xD4B30990
[42] PyMethod_New, address 0xD4B3C0C0
[43] PyVectorcall_Call, address 0xD4B3C590
[44] PyInit_QtCore, address 0xF09EA730
[45] PyInit_QtCore, address 0xF09EA730
[46] PyInit_QtCore, address 0xF09EA730
[47] PyInit_QtCore, address 0xF09EA730
[48] PyInit_QtCore, address 0xF09EA730
[49] ZN7QObject5eventEP6QEvent, address 0xF6262330
[50] ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent, address 0xF5A87F50
[51] PyInit_QtWidgets, address 0xF03CECA0
[52] ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent, address 0xF6234910
[53] ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData, address 0xF623AF90
[54] qt_plugin_instance, address 0xEFF3EEF0
[55] ZN21QEventDispatcherWin3213processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE, address 0xF6290990
[56] qt_plugin_instance, address 0xEFF3EEF0
[57] ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE, address 0xF6233350
[58] ZN16QCoreApplication4execEv, address 0xF623C0B0
[59] PyInit_QtWidgets, address 0xF03CECA0
[60] PyLong_FromUnsignedLong, address 0xD4B3F890
[61] PyObject_MakeTpCall, address 0xD4B2B9E0
[62] PyEval_EvalFrameDefault, address 0xD4B20A00
---- End of Stack Trace ----

C:\Program Files\OpenShot Video Editor>

[jonoomph]

Experimental Timeline - OpenShot struggles with large project and crashes as well.