Fix Firefox dnd highlighting bug (microbit-foundation#611)

microbit-robert · web-flow · commit 3c9bb17573e1 · 2022-02-22T15:59:09.000Z
Default to transition: none on cm-line class to remove latent dnd highlighting. Closes microbit-foundation#537.
diff --git a/src/editor/codemirror/themeExtensions.ts b/src/editor/codemirror/themeExtensions.ts
@@ -84,6 +84,9 @@ export const themeExtensions = (fontSize: string) => {
     ".cm-widgetBuffer": {
       display: "inline",
     },
+    ".cm-line": {
+      transition: "none",
+    },
   });
 };
 
