fix: :: symbols appearing between lines when pasting plaintext (#3323)

closes #3319

shared/editor/rules/emoji.ts

@@ -3,8 +3,16 @@ import MarkdownIt from "markdown-it";
 import emojiPlugin from "markdown-it-emoji";
 
 export default function emoji(md: MarkdownIt) {
+  // Ideally this would be an empty object, but due to a bug in markdown-it-emoji
+  // passing an empty object results in newlines becoming emojis. Until this is
+  // fixed at least one key is required. See:
+  // https://github.com/markdown-it/markdown-it-emoji/issues/46
+  const noMapping = {
+    no_name_mapping: "💯",
+  };
+
   return emojiPlugin(md, {
-    defs: (md.options as any).emoji === false ? {} : nameToEmoji,
+    defs: (md.options as any).emoji === false ? noMapping : nameToEmoji,
     shortcuts: {},
   });
 }