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Data selection for ROI image #1238

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@sergey-yaroslavtsev

There are several strange behaviors when selecting datasets as signal and axes for ROI image. For example dataset of NxM can be open with grid (not scatter) when 1d data is last dimension but could not be when 1d data is first dimension . There is a strange silent (for user) behavior if dimensions of dataset contain singletons (some times they are dropped) - is probably done for a reason (some strange data structure) but it is not clear when user do selection - and it can be incompatible with some options. There was also a "hidden" feature to open 2D images (when dataset have no channels - or in other words there is only one "imaginary" channel) which was not working considerAsImages.

HDF5Wizzard start to have validation check for scatter mode so now i am sure it is required in a proper form for all selections.

To open images in ROI image could be a good thing but it should not be done silently - since we have already options 1D data is first dimension 1D data is last dimension we can simply add no 1D data (image).

Drop of singletons should be simple Yes/No question after selection. (It should happen before all validations ofc)

Already start work on it.

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