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( based on https://bugzilla.mozilla.org/show_bug.cgi?id=779882 ) Some characters change the line height, thus breaking Orion's rendering, because it relies on a fixed line height. In the Mozilla bug report mentioned above, on Macs, with the default monospace font, if you add the "⌘" character to a line, Orion starts misbehaving. I am not sure if there's anything that can be done in Orion for such cases? Except bug 334910.
The editor now switches to variable line height when necessary.