Issue Summary

In the edit mode when we add or edit a heading the cursor jumps to the beginning of the page. This only happens with the Safari browser.

Steps to Reproduce

1. Create a new page.
2. Add two plain-text lines.
3. Change the second line into a heading.
4. The cursor will move to the beginning of the first line.

Expected Results

The cursor should stay at the last position.

Actual Results

The cursor is jumping at the beginning of the page.

Workaround

Use Google Chrome or other supported browsers.