remove newlines because deno's base64 decoder became more strict

Author: cscheid

src/core/jupyter/jupyter.ts

@@ -1991,7 +1991,7 @@ function mdImageOutput(
   // get the data
   const imageText = Array.isArray(data)
     ? (data as string[]).join("")
-    : data as string;
+    : (data as string).trim();
 
   const outputFile = join(options.assets.base_dir, imageFile);
   if (
@@ -2002,7 +2002,9 @@ function mdImageOutput(
     // https://github.com/quarto-dev/quarto-cli/issues/9793
     !/<svg/.test(imageText)
   ) {
-    const imageData = base64decode(imageText);
+    // we need to remove the newlines from the base64 encoded data
+    // because base64decode doesn't like the multiline-encoded style
+    const imageData = base64decode(imageText.replaceAll("\n", ""));
 
     // if we are in retina mode, then derive width and height from the image
     if (