Forward/back buttons to undo/redo actions

USE CASE: WHAT DO YOU WANT TO DO?

If a user inadvertently does something that takes them away from where they just were or accidentally alters the data, it would be nice to have the ability to undo/redo actions.

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

Perform a series of steps/operations
Undo that last performed step(s) using command-a
Redo the previously undone steps using command-option-z

CURRENT BEHAVIOR

No ability to under/redo

EXPECTED BEHAVIOR

See USE CASE above.

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

Make the operations file-specific.
Do not support undo/redo operations after a file has been closed
Track all types of operations:
- scroll/move (not each step, but the location where started/ended up)
- selections
- searches
- zoom (not each step, but the location where started/ended up)
- cluster
- show trees
- label changes
- color changes
Preferences reset should clear the operation history

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

a bunch

LEVEL OF EFFORT - developers only

major

COMMENTS

Edited based on inspiration from issue #367, though note that remembering clustering history is distinct from operation history. Clustering history for a particular file, as in #367, should be remembered through separate openings of files & treeview restarts.

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