According to Doitsu's tests that he reported in that thread, on ADE v 2.4.5 the emdash would still break onto a new line. (Remember, this was looking for a way to keep emdash attached to its word at the end of a sentence.). The "inline-block" method seems to keep the emdash glued on.
I think white-space: no-wrap will force your line to bleed off the edge of the screen.
I use white-space: pre-wrap, which will preserve the spacing, but will still wrap the line to keep it from flowing off the side.
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