check selection's visible width when copying on mouse click (#2711)

* check selection's visible width when copying on mouse click

Mouse-click-up copies the selection produced by dragging. The event
is ignored if the selection has a width of 1 though so you don't
copy when clicking rather than dragging. The current check copies
text when it has a visible width of 1 but is actually multiple
characters in the rope like a CRLF line-ending. With this change
we check the unicode width of the character(s) in the selection
rather than the range length, so clicking on a CRLF line-ending
does not copy.

* use range.fragment to simplify getting the primary selection width

0 files changed, 0 insertions, 0 deletions