Possible memory leak in Qt's QScroller

[RudolfCardinal]

Running CamCOPS with memory leak debugging (sudo apt install valgrind, then the "Memcheck" option from the Qt Creator menu) shows multiple instances of e.g.

16 bytes in 1 blocks are definitely lost in loss record <x> of <n> ... uifunc.cpp:559:0
32 bytes in 2 blocks are definitely lost in loss record <y> of <n> ... uifunc.cpp:559:0

This line is in the function void applyScrollGestures(QWidget* widget), and is

QScroller::grabGesture(widget, gesture_type);  // will ungrab any other

This is a known Qt bug:

• https://forum.qt.io/topic/156398/both-asan-and-valgrind-show-memory-leak-in-qscroller-grabgesture-qobject-qscroller-scrollergesturetype
• https://bugreports.qt.io/browse/QTBUG-82355

Our action therefore likely to be: wait for the fix.