Hide and Unhide (Show) columns in Project Explorer if there are more than e.g. 10 columns
Imagine there are 1k or even more columns (variables) in a project, In fact, recently such a file with 1k columns was published in one of LabPlot's bug reports. For UX and performance reasons add new options to Project Explorer: "Hide" by default and "Unhide" on request (or "Show") columns in Project Explorer if there are more than e.g. 10 columns. Just a proposition:
Col1, Col2, ..., Col10, "Show next 10", "Show All".
Edited by Dariusz Laska