1. Select theme with thick strip in line number block.
2. Save and restart. Open some file. Нou see that the first characters of the lines are hidden under stripe.
3. Open another file. All display properly.
4. If you see carefully that the whole block with line numbers in the first case is shifted to the left.
   First file
   
   Second file
   

.cm-s-rubyblue .CodeMirror-gutters { background: #1F4661; border-right: 10px solid #3E7087; }