Crash in the example dtkWidgetsMenu
In the branch develop, at commit 1260e620, the bug can be triggered with these reproduction steps:
Move the cursor (without clicking) inside a double spin box, (a double spin box for a real, not for an int: for example 'prec 5.000' but not 'hyp'), then scroll with the mouse wheel up or down.
Expected behavior: the view scrolls. Observed behavior: the program crashes.
Additional information from the debugger:
- the segfault occurrs at this line: src/dtkWidgets/dtkWidgetsParameterDouble SpinBox.cpp:75
- the variables 'd' and 'd->spin_box' are not obviously wrong (not nullptr).