Mark corresponding variable in String.formatted(..) if cursor is on %s (and vice versa)

[reuschling]

If you have big Strings, e.g. block Strings, with some %s (or other) placeholders for variables that are then inserted with an .formatted(...) invocation, it is sometimes really hard to see

1. where the placeholder occurs in the String, or
2. which variable name the placeholder refers to.

For 1. a solution would be to mark the corresponding placeholder inside the String if the cursor is on a variable inside .formatted(...)

For 2. one solution would be to highlight the according variable inside the .formatted(..) invocation. An alternative would be a popup with the variable name.

[fbricon]

How about providing inlay hints instead? that would cover both cases IMHO:

    IO.println("Hello %s and welcome!".formatted(name));

would render as :

    IO.println("Hello %s :name and welcome!".formatted(name));

No need to hover, you know exactly which placeholder matches to what

[fbricon]

like that :-)