Correct indentation not applied to when expressions with trailing commas enabled

[jkmckay]

Expected Behavior

When running detekt with both trailing commas and indentation enabled, i.e.

  Indentation:
    active: true
    autoCorrect: true
    indentSize: 4
    continuationIndentSize: 4
/* ... */
  TrailingComma:
    active: true
    autoCorrect: true
    allowTrailingComma: true
    allowTrailingCommaOnCallSite: true

Trailing commas should be added as appropriate and indentation should be applied.

For example something like this:

enum class TestEnum { EXAMPLE_A, EXAMPLE_B, EXAMPLE_C }

fun exampleFunction(enum: TestEnum) {
    when (enum) {
        TestEnum.EXAMPLE_A,
        TestEnum.EXAMPLE_B -> enum.toString()
        else -> {}
    }
}

should be formatted as this:

enum class TestEnum { EXAMPLE_A, EXAMPLE_B, EXAMPLE_C }

fun exampleFunction(enum: TestEnum) {
    when (enum) {
        TestEnum.EXAMPLE_A,
        TestEnum.EXAMPLE_B,
        -> enum.toString()
        else -> {}
    }
}

Observed Behavior

What happens is this:
(until detekt is ran for a second time and then the expected output is produced.)

enum class TestEnum { EXAMPLE_A, EXAMPLE_B, EXAMPLE_C }

fun exampleFunction(enum: TestEnum) {
    when (enum) {
        TestEnum.EXAMPLE_A,
        TestEnum.EXAMPLE_B,
-> enum.toString()
        else -> {}
    }
}

Steps to Reproduce

Enable trailing commas and observe when expresssions formatting incorrectly on first run of detekt.

Context

Preventing team from agreeing to enable the trailing commas option and manually formatting.

Your Environment

Tested on Detekt 1.19.0 & 1.21.0

[schalkms]

Both mentioned rules are native ktlint rules. Detekt just provides a wrapper around them.
Could you please try to reproduce this with plain ktlint and potentially report to this to their repo?

[jkmckay]

Thanks, I've checked the Ktlint repo and an open issue for this already exists. Will close this one.