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Fixes BUG #15645.

Utkarsh Ayachit requested to merge utkarsh.ayachit/paraview:15645_fix_segfault into master

The reported issue was arising because of the fact the pqSpinBox would fire editingFinished() event when it is disabled while it had the focus. Since disabling a widget makes it loose the focus, it would fire the editingFinished() signal. pqAnimationTimeWidget was observing that signal and then trying to change the time on a non-existant TimeKeeper proxy and hence the segfault.

The fix extends pqSpinBox to add new signal valueChangedAndEditingFinished (similar in spirit to what we do with pqLineEdit) to limit the overzealous firing of editingFinished() signal. That addresses the reported segfault.

Fixes BUG #15645

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