Added auto-focus behaviour to page editor

- Will focus on title if the value of the field matches the default text
for the current user's language.
- Otherwise will focus on the editor body.
- Added and tested on both editors.

For #2036

resources/js/components/markdown-editor.js

@@ -557,6 +557,11 @@ class MarkdownEditor {
             const prependLineCount = markdown.split('\n').length;
             this.cm.setCursor(cursorPos.line + prependLineCount, cursorPos.ch);
         });
+
+        // Focus on editor
+        window.$events.listen('editor::focus', () => {
+            this.cm.focus();
+        });
     }
 }