[lmi] Yet another census view UI question: starting editing with space

[Vadim Zeitlin]

 Hello,

 During the (N+1)-st round of the tests comparing the behaviour of
wxGrid-based census view with the current wxDVC-based one, we've found
another relatively significant change of behaviour: currently, pressing
"Space" key when the column with a text value, such as "Insured name", is
selected, starts editing the cell value by selecting it entirely, but not
otherwise modifying it. This is convenient because an arrow key (or Home
etc) can be pressed if the existing string must be modified, or any
alphanumeric key (or Delete/Backspace) can be pressed to directly start
entering the new value.

 With wxGrid behaviour is different and similar to that of the spreadsheet
programs, i.e. pressing "Space" starts editing and clears the existing cell
contents. This is consistent with the behaviour of the other keys, as now
any alphanumeric key can be pressed to start editing a text field, e.g. you
can start directly typing its value (which is, again, consistent with how
this works in the spreadsheets). However it makes modifying the existing
value more complicated, as you either need to press Ctrl-Z to undo the
change and restore the original value immediately after starting to edit it
or press F2 to start editing instead (which is convenient, but I'm afraid
might be completely unknown to the actual program users). It is also
inconsistent not only with the old lmi behaviour, but with the behaviour of
other, non-text, fields as pressing Space on a date or a numeric field does
not reset it, this only happens for the text fields.


 After spending quite some time thinking about it and experimenting with
both possibilities, I still can't decide which one would be preferable. I
also have a nagging suspicion that this might be completely irrelevant if
the real users use the mouse to click on a cell to start editing it instead
of the keyboard anyhow, but this suspicion is not strong enough to allow me
to convince myself that this is not important.

 So I'd like to ask you for help: do you have any preferences here? In the
absence of any strong opinions in either direction, I'm probably going to
leave the new behaviour as it is right now, because this is what wxGrid
does by default, and so doesn't require any extra code to implement. But
please let me know if you think differently.

 Thanks in advance!
VZ

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