Unexpected behavior when pressing backspace at the beginning of paragraph

[vasconita]

Unexpected behavior when pressing backspace at the beginning of paragraph

Steps for Reproduction

1. Visit quilljs.com
2. Write a line with heading style
3. Enter line break
4. Write other line with subheading style
5. Delete the content of heading line
6. Go to the beginning of subheading line
7. Press backspace

Expected behavior: I expect to preserve my subheading style.

Actual behavior: It changes the style of my paragraph to heading style.

Platforms: Google Chrome 56.0.2924.87 (64-bit) in Windows 10

Version: 1.2.2

[vasconita]

Thanks @jhchen! 😉