Support sorting options in file browsing widget(s)

[markcmiller86]

Is your feature request related to a problem?

Opening an existing file involves a Qt widget (perhaps custom within VisIt) that displays the list of files. When that list is long, it helps to be able to sort it by various file attributes including date (created and/or modified), alphabeticly, maybe by size and maybe even some kind of grouping, beyond merely recognizing all the files that may be part of a time series (which is what VisIt's grouping semantics are all about).

Beyond opening a file, there are other cases where users wind up browsing the file system through VisIt's GUI to save or open files (e.g. to load color tables or session files or maybe to save the main window).

I don't know if our file browsing widget is custom or not but its lacking the ability to sort (and display) various file attributes that are often useful to users. For example, ChatGPT recommends using QFileSystemModel and there is no evidence of use of that in our existing GUI.

So, this request is to enhance our file system browsing widget to support this features...which I think are very common across multiple platforms.

This originates from E3SM, @iulian787 and @vijaysm