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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

The "gmerge-command" setting:

The value is a graphical merge conflict resolver command operating
on four files.  Examples:

    kdiff3 "%baseline" "%original" "%merge" -o "%output"
    xxdiff "%original" "%baseline" "%merge" -M "%output"
    meld "%baseline" "%original" "%merge" "%output"