screen.ts getBuffer debugging else branch by writing to rowBuffer

Author: KierPalin

screen.ts

@@ -150,8 +150,12 @@ namespace user_interface_base {
 
             // Simply get the row, slice off the required bytes:
             else {
-                basic.showNumber(chunkIndex)
+                // basic.showNumber(chunkIndex)
                 const rowBuf = Buffer.create(bitmap.width);
+                for (let i = 0; i < rowBuf.length; i++) {
+                    rowBuf[i] = 3;    
+                }
+
                 bitmap.getRows(startingRow, rowBuf);
                 const res = rowBuf.slice(startIndex % width, chunkSize);
                 if (res.length > 16)