Indentation error on malformed formatter closing tag

[paul-dingemans]

From nbadal/ktlint-intellij-plugin#535

Given .editorconfig:

root = true

[*.{kt,kts}]
ij_formatter_tags_enabled = true

This problem does not seem to be caused by the ktlint-intellij-plugin but in ktlint itself. I can reproduce the exact same stacktrace, by malforming the "@Formatter:on" tag:

$ ktlint-1.3.0 --stdin
08:03:08.208 [main] INFO com.pinterest.ktlint.cli.internal.KtlintCommandLine -- Enable default patterns [**/*.kt, **/*.kts]
fun foo123() {
    // @formatter:off
    listOf(
        "x" to 1, "x" to 2, "x" to 3,
        "x" to 1, "x" to 2, "x" to 3,
        "y" to 1, "y" to 2, "y" to 3,
        "z" to 1, "z" to 2, "z" to 3,
    )
    // The "@formatted:on" tag below is malformed on purpose.
    // It will cause an exception when indenting
    // @formstter:on
}

Exception in thread "main" java.lang.IllegalArgumentException: Stack should be empty:
        IndentContext(fromASTNode=Element(kotlin.FILE), toASTNode=PsiWhiteSpace, nodeIndent=, firstChildIndent=, childIndent=, lastChildIndent=, activated=true)
        IndentContext(fromASTNode=BLOCK, toASTNode=PsiElement(RBRACE), nodeIndent=, firstChildIndent=    , childIndent=    , lastChildIndent=    , activated=false)
        IndentContext(fromASTNode=PsiElement(LBRACE), toASTNode=PsiElement(RBRACE), nodeIndent=, firstChildIndent=, childIndent=    , lastChildIndent=, activated=true)
        at com.pinterest.ktlint.ruleset.standard.rules.IndentationRule.afterLastNode(IndentationRule.kt:1066)
        at com.pinterest.ktlint.rule.engine.internal.RuleExecutionContext.executeRule(RuleExecutionContext.kt:65)
        at com.pinterest.ktlint.rule.engine.internal.CodeFormatter.executeRule(CodeFormatter.kt:116)
        at com.pinterest.ktlint.rule.engine.internal.CodeFormatter.format(CodeFormatter.kt:87)
        at com.pinterest.ktlint.rule.engine.internal.CodeFormatter.format(CodeFormatter.kt:56)
        at com.pinterest.ktlint.rule.engine.internal.CodeFormatter.format(CodeFormatter.kt:27)
        at com.pinterest.ktlint.rule.engine.api.KtLintRuleEngine.lint(KtLintRuleEngine.kt:91)
        at com.pinterest.ktlint.cli.internal.KtlintCommandLine.lint(KtlintCommandLine.kt:558)
        at com.pinterest.ktlint.cli.internal.KtlintCommandLine.process(KtlintCommandLine.kt:466)
        at com.pinterest.ktlint.cli.internal.KtlintCommandLine.lintStdin(KtlintCommandLine.kt:425)
        at com.pinterest.ktlint.cli.internal.KtlintCommandLine.lintOrFormat(KtlintCommandLine.kt:296)
        at com.pinterest.ktlint.cli.internal.KtlintCommandLine.run(KtlintCommandLine.kt:246)
        at com.github.ajalt.clikt.parsers.Parser.finalizeAndRun(Parser.kt:348)
        at com.github.ajalt.clikt.parsers.Parser.parse(Parser.kt:218)
        at com.github.ajalt.clikt.parsers.Parser.parse(Parser.kt:42)
        at com.github.ajalt.clikt.core.CliktCommand.parse(CliktCommand.kt:457)
        at com.github.ajalt.clikt.core.CliktCommand.parse$default(CliktCommand.kt:454)
        at com.github.ajalt.clikt.core.CliktCommand.main(CliktCommand.kt:474)
        at com.github.ajalt.clikt.core.CliktCommand.main(CliktCommand.kt:481)
        at com.pinterest.ktlint.Main.main(Main.kt:20)