I have a custom theme, and I have NOT defined either guide or activeGuide in the file:
// what normally should be defined, but I did NOT
<key>guide</key>
<string>#5e6469</string>
<key>activeGuide</key>
<string>#798188</string>
Nonetheless I can see the indentation lines (if I active them).
Is there any default place (besides the theme file) where they are defined?