I was wondering if there is a way to have the flag column precede the line number column in the buffer?
they should apply in the order you add the highlighters.
declare-option line-specs test_opt %val{timestamp} '1|hello' '2|world'
add-highlighter buffer/ flag-lines default test_opt
add-highlighter buffer/ number-lines
gives
1|hello*** this is a *scratch*
2|world*** use it for notes or open
swapping the order of the two add-highlighters gives
hello 1|*** this is a *scratch*
world 2|*** use it for notes or open