#34 EditMask: Numeric edit masks allow leading zeros

[Joshua Gertzen]

With an edit mask like ###,###,###.## it is possible to
type a leading-zero in the field. The correct behavior
is to only allow a 1-9 in the first character position,
and then to allow a 0-9 in all other positions.

The only exception to this is for formats like #.##, in
which case a 0-9 would be acceptible for the first #.

M#541

[al0]

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Edit mask with leading zeroes are quite useful for entering
fixed-length codes and such. The correct behavior is not to
disallow leading zeroes, but to have to distinct format
characters for digits - one to allow liading zeroes and
other not. But widely used convention they are 0 and #.

Another (more rarely used) approach is to use format
modifiers at the begiinig (or at the end) of format mask,
e.g. ###,### does not allow leading zeroes and (Z)###,###
allows them.