Re: Editing Sinhala and Similar Scripts

From: Andrew Cunningham <>
Date: Thu, 20 Mar 2014 15:21:59 +1100

There is also a distinction between editing an existing document that you
opened as distinct from writing a document, going back to a certain point
in document and editing that section within the same editing session.

In the first case their is no history, in the second case their may be
history to work with.


On 20 March 2014 14:43, Peter Constable <> wrote:

> If you click into the existing text in this email and backspace, what
> keystroke will you expect to be "erased"? Your system has no way of knowing
> what keystroke might have been involved in creating the text.
> What is _can_ make sense to talk about is to say that a user expects
> execution of a particular key sequence, such as pressing a Backspace key,
> to have a particular editing effect on the content of text. "Erasing a
> keystroke" and "keystrokes resulting in edits" are different things. One
> makes sense, the other does not.
> It may seem like I'm being pedantic, but I think the distinction is
> important. Our failure is in framing our thinking from years of experience
> (and perhaps some behaviours originally influenced by typewriter and
> teletype technologies) in which a keyboard has a bunch of keys that add
> characters, and variations on that that even include a lot of logic to get
> input keying sequences that can generate tens of thousands of different
> character; but then one or two keys (delete, backspace) that can only
> operate in very dumb ways. (We've also always assumed that any logic in
> keying behaviours can be conditioned only by the input sequences, but not
> by any existing content, but that steps beyond my earlier point.) These
> constraints in how we think limit possibilities
> Peter
> -----Original Message-----
> From: Doug Ewell []
> Sent: March 19, 2014 9:39 AM
> To: Peter Constable;
> Subject: RE: Editing Sinhala and Similar Scripts
> Peter Constable <petercon at microsoft dot com> wrote:
> >> There are two types of people:
> >>
> >> 1. those who fully expect Backspace to erase a single keystroke
> >
> > It is nonsensical to talk about erasing a _keystroke_.
> But that's what they expect.
> --
> Doug Ewell | Thornton, CO, USA
> | @DougEwell
> _______________________________________________
> Unicode mailing list

Andrew Cunningham
Project Manager, Research and Development
(Social and Digital Inclusion)
Public Libraries and Community Engagement
State Library of Victoria
328 Swanston Street
Melbourne VIC 3000
Ph: +61-3-8664-7430
Mobile: 0459 806 589

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Received on Wed Mar 19 2014 - 23:23:02 CDT

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