I was editing a xaringan slide deck using the most recent preview version 1.2.792 on Ubuntu 18.04. The slide deck containes the following emojis: , , , , , , , , and perhaps others. I observed the following behavior:
.Rmdfile often garbled it. I could not isolate a pattern, it looks like parts of the text were skipped or repeated. I'm pretty sure that it's the editor that breaks the file, because the
.Rmdis version-controlled, and I observed the garbled contents right after saving.
When positioning the caret left to any of these emojis and pressing "Cursor right", the caret ended up in the middle of the emoji. Pressing "space" created two three characters -- a space surrounded by two question-mark-like symbols. Pressing "Cursor right" again, instead of space, positioned the caret on the right of the emoji.