fix: Pasting plain text from VSCode (BLO-366) (#2713)

Author: matthewlipski

packages/core/src/api/clipboard/fromClipboard/handleVSCodePaste.ts

@@ -1,9 +1,6 @@
 import { EditorView } from "prosemirror-view";
 
-export async function handleVSCodePaste(
-  event: ClipboardEvent,
-  view: EditorView,
-) {
+export function handleVSCodePaste(event: ClipboardEvent, view: EditorView) {
   const { schema } = view.state;
 
   if (!event.clipboardData) {
@@ -17,8 +14,7 @@ export async function handleVSCodePaste(
   }
 
   if (!schema.nodes.codeBlock) {
-    view.pasteText(text);
-    return true;
+    return false;
   }
 
   const vscode = event.clipboardData!.getData("vscode-editor-data");

packages/core/src/api/clipboard/fromClipboard/pasteExtension.ts

@@ -57,8 +57,13 @@ function defaultPasteHandler({
   }
 
   if (format === "vscode-editor-data") {
-    handleVSCodePaste(event, editor.prosemirrorView);
-    return true;
+    // If VSCode clipboard data cannot be parsed as a code block, try parsing
+    // `text/plain` as a fallback.
+    if (handleVSCodePaste(event, editor.prosemirrorView)) {
+      return true;
+    }
+
+    format = "text/plain";
   }
 
   if (format === "Files") {