Enforced switch of Mainframe to "Data image" tab before new data files are added to Steca

This is a user request which was communicated in Dec 2023 by Weimin/Stress-Spec

If MainFrame is not switched to "Data image" tab before new files are added Steca will start processing those new data files and add the processed data to Polefigure tab automatically. This naturally requires processing time. Often this is unwanted and unnecessary since Stress-Spec want to go back and check/adapt settings before these new data are processed and added to Polefigure tab.

So if Stress-Spec users forget to change the MainFrame tab before adding files to Steca they are forced to spend time waiting until Steca has finished.

Therefore they requested: Steca should automatically switch Mainframe tab to Data image before new files are added.

As far as I understood: In earlier versions Steca just worked like this and it was changed for no reason.