Trailing Spaces Cause Delayed Error

[user-63]

Describe the bug
Trailing spaces cause an error when followed by a non empty line.

To Reproduce

1. input 1 + enter (no error)
2. input 1 (error on line 1)

Expected behavior
Consistent behavior with trailing spaces (preferably they don't cause errors). If a line can't end in trailing space(s) there should be an error immediately after pressing enter.

Screenshots

Desktop:

• OS: Fedora
• Version: siffra_0.2.2_amd64.AppImage