iter forward by one character offset. Note that images
embedded in the buffer occupy 1 character slot, so
gtkTextIterForwardChar may actually move onto an image instead
of a character, if you have images in your buffer. If
iter is the
end iterator or one character before it,
iter will now point at
the end iterator, and
convenience when writing loops.
iter moved and is dereferenceable
Derived by RGtkGen from GTK+ documentation
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