Pressing enter at the start of a line/section has unexpected results

[ErisDS]

Placing the cursor at the start of a line and pressing enter causes the line to move down in 0.2.1. In 0.2.2 it at first appears to do nothing.

If, after having pressed enter at the beginning of a line, you move the cursor to somewhere else on the same line and also press enter, the content of the line is duplicated before the new line is added.

How I reproduced:

• on master (58ffbc8) using broccoli serve to test the demo

Test 1:

• Place the cursor at the beginning of the first line, press enter
• nothing happens
• Place the cursor anywhere except the beginning of the second line, press enter
• the content of the line is duplicated and a new line is added

Test 2:

• Place the cursor at the beginning of the first line, press enter
• nothing happens
• Place the cursor anywhere except the beginning of the second line, press enter
• a new line is entered and no content is duplicated

Test 3:

• Place the cursor at the beginning of the first line, press enter multiple times
• Place the cursor at the beginning of the second line, press enter multiple times
• Place the cursor anywhere except the beginning of a line, press enter
• Content is duplicated on both lines!