An empty string as display property has the advantage over the invisible
property that it can be made conditional. However, an empty string as
display property does not work. Try this:
(defun test ()
(interactive)
(select-window (display-buffer (get-buffer-create "*test*")))
(erase-buffer)
(insert "line 1\naaa"
(propertize "bbb" 'display "")
"ccc\nline 3"))
Maybe someone who knows the redisplay code would like to look at this bug.
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