Fix indentation of a multiline parameter list inside a function literal for code style ktlint_official

documentation/snapshot/docs/rules/standard.md

@@ -758,7 +758,7 @@ Enforces the parameters of a function literal and the arrow to be written on the
 
 If the function literal contains multiple parameters and at least one parameter other than the first parameter starts on a new line than all parameters and the arrow are wrapped to separate lines.
 
-=== "[:material-heart:](#) Ktlint"
+=== "[:material-heart:](#) Ktlint (ktlint_official)"
 
     ```kotlin
     val foobar1 = { foo + bar }
@@ -775,6 +775,27 @@ If the function literal contains multiple parameters and at least one parameter
             foo + bar
         }
     val foobar5 = { foo: Foo, bar: Bar -> foo + bar }
+    val foobar6 =
+        {
+            foo: Foo,
+            bar: Bar,
+            ->
+            foo + bar
+        }
+
+    // Assume that the last allowed character is
+    // at the X character on the right           X
+    val foobar7 =
+        barrrrrrrrrrrrrr { 
+            fooooooooooooooo: Foo
+            ->
+            foo.repeat(2)
+        }
+    ```
+
+=== "[:material-heart:](#) Ktlint (non ktlint_official)"
+
+    ```kotlin
     val foobar6 =
         {
                 foo: Foo,
@@ -787,7 +808,7 @@ If the function literal contains multiple parameters and at least one parameter
     // at the X character on the right           X
     val foobar7 =
         barrrrrrrrrrrrrr { 
-              fooooooooooooooo: Foo
+                fooooooooooooooo: Foo
             ->
             foo.repeat(2)
         }

ktlint-rule-engine/src/main/kotlin/com/pinterest/ktlint/rule/engine/internal/RuleExecutionContext.kt

@@ -196,9 +196,9 @@ internal class RuleExecutionContext private constructor(
     @Deprecated(message = "Remove in Ktlint 2.0")
     private fun ((offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> AutocorrectDecision).onlyEmit() =
         {
-                offset: Int,
-                errorMessage: String,
-                canBeAutoCorrected: Boolean,
+            offset: Int,
+            errorMessage: String,
+            canBeAutoCorrected: Boolean,
             ->
             this(offset, errorMessage, canBeAutoCorrected)
             Unit

ktlint-ruleset-standard/src/main/kotlin/com/pinterest/ktlint/ruleset/standard/rules/IndentationRule.kt

@@ -517,14 +517,20 @@ public class IndentationRule :
 
     private fun ASTNode.calculateIndentOfFunctionLiteralParameters() =
         if (isFirstParameterOfFunctionLiteralPrecededByNewLine()) {
-            // val fieldExample =
-            //      LongNameClass {
-            //              paramA,
-            //              paramB,
-            //              paramC ->
-            //          ClassB(paramA, paramB, paramC)
-            //      }
-            indentConfig.indent.repeat(2)
+            if (codeStyle == ktlint_official) {
+                // Indent with single indent as defined in Kotlin Coding conventions
+                indentConfig.indent
+            } else {
+                // Comply with default IDEA formatting although it is not compliant with Kotlin Coding conventions
+                // val fieldExample =
+                //      LongNameClass {
+                //              paramA,
+                //              paramB,
+                //              paramC ->
+                //          ClassB(paramA, paramB, paramC)
+                //      }
+                indentConfig.indent.repeat(2)
+            }
         } else {
             // Allow default IntelliJ IDEA formatting:
             // val fieldExample =