Suggestions button doesn't work for lines with only numbers

Summary

If you try to add a suggestion to a line that only contains a number, it will fail to do anything.

Steps to reproduce

See video example:

Screen_Recording_2020-06-24_at_16.03.10

Bug examples

✅ means I could use the suggestion button, and ❌ means I couldn't:

• 1 ❌
• 1. ✅
• 1.111❌
• 1-1 ✅
• 12 ❌
• 12a ✅
• 123 abc ✅