Change to a combo save/save-as strategy

USE CASE: WHAT DO YOU WANT TO DO?

Not lose work if the computer or app crashes and allow me to save without having to enter a new file name & location.

STEPS TO REPRODUCE AN ISSUE (OR TRIGGER A NEW FEATURE)

Cluster the data

CURRENT BEHAVIOR

Clustering results are not saved until the user quits and they have to enter a file name and select/confirm the default location.

EXPECTED BEHAVIOR

A save dialog could be incorporated into the cluster dialog that is pre-filled in the way we used to do it, and that file & location will be used to immediately save without bothering the user. It could be under a checkbox that's pre-checked to "save the result". If they uncheck it, there's no save and no prompt upon completion.

There should be different behaviors between command-s and command-shift-s. Command-shift-s and command-s (when saving for the first time) should both prompt the user with a save-as dialog. But if they have previously done that (I.e. the current file is not the original input file), just overwrite the previously selected output file with the current state of the data.

Alternatively, prompt to save or don't save clustering results immediately upon completion of clustering. If they "don't save", the data remains clustered and they should still be prompted to save once more upon quitting.

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

none

FILES AFFECTED (where the changes will be implemented) - developers only

unknown

LEVEL OF EFFORT - developers only

minor

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