Re: [TCLCORE] TIP #449: [text] undo/redo to Return Range of Characters

François Vogel <fvog...@free.fr> proposed:
>  EXAMPLE> =========>>      package require Tk>>      pack [text .t -undo true]>      .t insert end "Hello World.\n">      .t edit separator>      .t insert end "Again hello.\n">>      .t edit undo  ; # will now return {2.0 3.0}>      .t edit redo  ; # will now return {2.0 3.0}

This seems asymmetric with the indices returned by undo
referring to the text as it was before the undo, whereas
the indices from redo refer to the text after the redo.

Would this be the same if the undone action was delete
rather than insert?

I would think the useful indices would always point to the
text as it is now, after the undo/redo, even if that is not
a range at all.

Using manual separators, as shown, brings up the possibility
that an undo operates on several ranges of characters.

Donald Arseneau, TRIUMF CMMS, a...@triumf.ca


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