feat: Two more cases of typing in code marks, closes #3375

shared/editor/marks/Code.ts

@@ -5,6 +5,7 @@ import {
   Node as ProsemirrorNode,
   Mark as ProsemirrorMark,
 } from "prosemirror-model";
+import { Plugin } from "prosemirror-state";
 import moveLeft from "../commands/moveLeft";
 import moveRight from "../commands/moveRight";
 import markInputRule from "../lib/markInputRule";
@@ -59,6 +60,80 @@ export default class Code extends Mark {
     };
   }
 
+  get plugins() {
+    return [
+      new Plugin({
+        props: {
+          // Typing a character inside of two backticks will wrap the character
+          // in an inline code mark.
+          handleTextInput: (view, from: number, to: number, text: string) => {
+            const { state } = view;
+
+            // Prevent access out of document bounds
+            if (from === 0 || to === state.doc.nodeSize - 1 || text === "`") {
+              return false;
+            }
+
+            if (
+              from === to &&
+              state.doc.textBetween(from - 1, from) === "`" &&
+              state.doc.textBetween(to, to + 1) === "`"
+            ) {
+              const start = from - 1;
+              const end = to + 1;
+              view.dispatch(
+                state.tr
+                  .delete(start, end)
+                  .insertText(text, start)
+                  .addMark(
+                    start,
+                    start + text.length,
+                    state.schema.marks.code_inline.create()
+                  )
+              );
+              return true;
+            }
+
+            return false;
+          },
+
+          // Pasting a character inside of two backticks will wrap the character
+          // in an inline code mark.
+          handlePaste: (view, _event, slice) => {
+            const { state } = view;
+            const { from, to } = state.selection;
+
+            // Prevent access out of document bounds
+            if (from === 0 || to === state.doc.nodeSize - 1) {
+              return false;
+            }
+
+            const start = from - 1;
+            const end = to + 1;
+            if (
+              from === to &&
+              state.doc.textBetween(start, from) === "`" &&
+              state.doc.textBetween(to, end) === "`"
+            ) {
+              view.dispatch(
+                state.tr
+                  .replaceRange(start, end, slice)
+                  .addMark(
+                    start,
+                    start + slice.size,
+                    state.schema.marks.code_inline.create()
+                  )
+              );
+              return true;
+            }
+
+            return false;
+          },
+        },
+      }),
+    ];
+  }
+
   toMarkdown() {
     return {
       open(