Re: Is there a way to know if this-command altered the buffer?

[Emanuel Berg]

Marcin Borkowski wrote:

> I want to run some function in a certain hook. This function
> will update some info displayed using an overlay. The info
> depends on the buffer contents and is pretty expensive to
> compute, so I'd like to only display it if the buffer
> really changed.
>
> Is there a way to know if `this-command' actually changed
> the buffer (as opposed to e.g. point motion)?

Maybe these

  buffer-chars-modified-tick
  buffer-modified-tick

?

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