In otbgui, block mouse wheel events of
QComboBox widgets for choice parameters, and output image pixel type selection. This is to improve UX when scrolling in applications with many parameters. Scrolling in the list of parameters can result in a combo box taking the focus, and users accidentally changing a choice parameter or a numerical value.
Note that it's already in place for int and float parameters. This MR refactors the event filter in
QtWidgetParameterBase so that any children can register it.
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