Issues editing unicode character docs

[dizzzz]

from https://stackoverflow.com/questions/36371056/unable-to-properly-edit-unicode-charachters-in-exide:

the backspace and delete buttons seem to delete characters that are not under the cursor.

• chrome 50 / macsox
• safari 9.1 / maxosx

attached is a file with special characters

test.xml.txt

[joewiz]

I think this is an inherent problem with the ace editor - see https://github.com/ajaxorg/ace/search?q=unicode&type=Issues&utf8=%E2%9C%93 and https://www.google.com/webhp?hl=en&q=site:github.com/ajaxorg/ace/+unicode.

And according to ajaxorg/ace#3037 (comment):

This happens with many non-ascii characters (and the same error occurs in the github editor)
estimated chance of being fixed : 0.071%

So... close as "wontfix"?

[duncdrum]

I d say this is core browser territory. @joewiz Let me have a look with some of my own files, where I managed to work around the problem with some editors. Chances are thus is beyond eXide s influence.

[duncdrum]

yup font substitution in ace is playing tricks, even with files that the browser/ OS can actually handle. See also this PR with a potential fix for BIDI languages, in essence overriding ace's font-selection.

I vote not to close, so there is a place to track ace's development, and for users to see that its a known issues.

Maybe a similar overriding of ace font selection could be implemented in exide based on @xml:lang? People use eXide to work with xml in the browser. Both the browser and xml can handle Unicode, so eXide should to. This wouldn't solve the problem for .txt or .xq but could offer a workable compromise.