michael-jeulinl/VTK — comment on commit 439bd19e7ce880eacbabd48c4039d8eff7641cf9
File: Widgets/vtkImplicitPlaneWidget2.cxx line 373
By finetjul:

if InvokeInteractionCallback is a general/standard widget method, the test on MTime() shouldn't be done here but where it is call.