Selection does not work with all OS X text Services

[lastobelus]

All OS X text services that act on a selection are broken, and the selected text is not passed to the service. I haven't dug into the mechanics of this, but it is the cause of #2446.

OS X Text services are a very popular way of adding functionality across editors. See for example Markdown Service Tools, SearchLink

Also see HappenApps/Quiver#163

[lastobelus]

Also see markpluslabs/react-markplus#30

[nightwing]

This happens because Ace creates dom nodes only for the visible part of the text, and doesn't create browser selection.
We could put selected text into the textarea if the selection is small (e.g < 1000 characters) but doing that for larger selections would make editor very slow.

[lastobelus]

handling small selections would satisfy the majority of needs I think.

[lastobelus]

the only exception would be using searchlink to switch a whole document's links between inline & reference style.

[nightwing]

#3635 fixes the issue for small selections