Multi-emoji Unicode emojis do not delete properly #116
Description
Some emojis are comprised of multiple other emojis separated by a ZWJ. For example, 👩🍳 is 👩 and 🍳. Image mode will display these incorrectly (as two distinct emojis), but unicode mode has the correct rendering. However, if one tries to delete 👩🍳, it will turn into 👩 with a trailing ZWJ. Similar happens when deleting from the front (leading ZWJ, trailing 🍳). The text in unicode mode does not have the 'emojified property, so the custom deletion functions do not properly delete the region the emoji occupies.