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Re: Multiple UNDO - a simple proposal

  • To: mathgroup at
  • Subject: [mg78075] Re: Multiple UNDO - a simple proposal
  • From: carsten_herrmann1 at
  • Date: Fri, 22 Jun 2007 06:42:56 -0400 (EDT)
  • References: <f531d6$1uf$>

let me express a "feeling" - I know that here is not really the place
for feeling s -

the problem of missing undo may als be related to the missing process
completion status bar for Mathematica evaluations

could that be the case ?


On 17 Jun., 12:11, David Bailey <dave at> wrote:
> Much has been written about the complexity involved in implementing
> multiple undo in a Mathematica notebook.
> Obviously a notebook can receive changes from several sources - the user
> typing, and various forms of data emanating from the kernel. However,
> 99% of the time, the user is concerned with  recovering his input cells
> that he may have spent hours crafting. Computers are so stable nowadays,
> and multiple undo is so effective in most applications, that many users
> no longer think in terms of saving their work regularly. In past
> versions of Mathematica, any crashes were pretty much confined to the
> kernel, but with 6.0 it seems to be easier to crash the FE - and with
> it, any unsaved work!
> Why not compromise and say that no cell will have an undo chain if it:
> 1) Contains Dynamic constructs.
> 2) Is an Output cell.
> 3) Contains any other specified features that WRI find cause problems.
> Undo points will only be placed at points where the kernel is at idle.
> As an additional simplification, possibly the user would have to choose
> between the multiple undo feature and the freedom to continue typing
> while the kernel is executing a command.
> I would suggest that the undo information should be buffered on disk at
> frequent intervals so that an FE crash would be less disastrous. I
> suspect that the occasional FE crash is an inevitable consequence of the
> very dynamic coupling between kernel and FE that now pertains. Indeed,
> it was one such crash that prompted me to write this post!
> David Bailey

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