Jumping cursors

Ali Lloyd ali.lloyd at livecode.com
Thu Jan 5 09:36:58 CET 2017

0xFF001 appears to be an invalid unicode character, residing in the private
use area. When I try
> set the text of the selectedText to numToCodepoint(0xff001)
The text is replaced by a character that LiveCode appears to think is RTL,
and the cursor splits as it does when placed 'ahead' of an RTL character in
mixed text. If you replace all the text of a line with it, it will
therefore place the cursor to the left of the character.

Whether this is a bug or not depends on whether 0xFF001 *should* be treated
as RTL or not. I kind of suspect it isn't, but making sure codepoints from
the private use area behave correctly in a field is unlikely to be a high
priority fix, unless you have a good reason for doing it!

On Wed, Jan 4, 2017 at 11:49 PM Kay C Lan <lan.kc.macmail at gmail.com> wrote:

> On Thu, Jan 5, 2017 at 5:26 AM, J. Landman Gay <jacque at hyperactivesw.com>
> wrote:
> >
> > I'm a little surprised that works at all. The "selectedtext" returns a
> > string, not a position. I'd use "selectedChunk" which would provide a
> > character location, enabling you to set the cursor at a specific
> position.
> >
> Whilst your definitions of 'selectedText' and 'selectedChunk' are
> correct, the fact is that 'set the text of the selectedText to "abc"'
> does replace whatever text you've hilited with whatever text you've
> specified regardless of whether the text you've hilighted is a long
> string, a short string or an empty string. The 'normal' result of
> doing such is that the cursor ends up and the right hand end of the
> new text, but apparently not so if the new text is
> numToCodePoint(0xFF001)
> I think Richmond should file a Bug report because it does seem he's
> found an anomaly, or at the very least, if there is a valid reason why
> this is the case for 0xFF001 (and possibly others) then maybe a Note
> in the Dictionary describing this situation would be useful.
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