Make automatic enumeration more restrictive

[arcturus140]

Current behavior

In Markdown notes, Boostnote automatically adds a new bullet point when enumeration is used, i.e the text input in the form ^\s*\d+\.\s*\S.*$ is always followed by ^\s*\d+\.\s*$

Example:

1. listelement

automatically adds a new element:

1. listelement
2.

this also works with no empty space

1.listelement
2.

Expected behavior

automatic enumeration should be triggered using the following format, instead:

current: ^\s*\d+\.\s*\S.*$ expect: ^\s*\d+\.\s+\S.*$

for the following reasons:

1. current behaviour causes undesired behaviour in some cases, as described in #3609, #3376 and other cases
2. it is more consistent with automatic enumeration for unordered lists

for example, Boostnote already follows this format in:

^\s*\-\s+\S.*$ ^\s*\+\s+\S.*$ ^\s*\*\s+\S.*$

Steps to reproduce

1. create a new Markdown note
2. insert the text 1. followed by Enter
3. new line followed by 2. should not be appended to the text

Environment

• Boostnote version: 0.15.3

[Flexo013]

The space after the period should indeed be mandatory for the automatic enumeration.