Fix idempotency problem when reformatting type declaration with large when clause (#2897)

* Fix idempotency problem when reformatting type declaration with large when clause

* Update unit test.

* Add 6.0.5 release version

---------

Co-authored-by: Florian Verdonck <[email protected]>

Author: etareduction

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## [6.0.5] - 2023-06-06
+
+### Fixed
+* Idempotency problem when reformatting type declaration with large when clause. [#2896](https://github.com/fsprojects/fantomas/issues/2896)
+
 ## [6.0.4] - 2023-06-02
 
 ### Changed

src/Fantomas.Core.Tests/FunctionDefinitionTests.fs

@@ -1353,3 +1353,30 @@ let inline repro (a: ^``QuotedWithIllegalChar<'T>``) = ()
         """
 let inline repro (a: ^``QuotedWithIllegalChar<'T>``) = ()
 """
+
+[<Test>]
+let ``multiline member constraints on type parameters, 2896`` () =
+    formatSourceString
+        false
+        """
+let inline func
+    (arg:
+        'a when 'a: (member a: int) and 'a: (member b: int) and 'a: (member c: int) and 'a: (member d: int) and 'a: (member e: int))
+    = 0
+        """
+        config
+    |> prepend newline
+    |> should
+        equal
+        """
+let inline func
+    (arg:
+        'a
+            when 'a: (member a: int)
+            and 'a: (member b: int)
+            and 'a: (member c: int)
+            and 'a: (member d: int)
+            and 'a: (member e: int))
+    =
+    0
+"""

src/Fantomas.Core/CodePrinter.fs

@@ -3062,13 +3062,7 @@ let genType (t: Type) =
         +> genSingleTextNode node.ClosingParen
         |> genNode node
     | Type.WithSubTypeConstraint tc -> genTypeConstraint tc
-    | Type.WithGlobalConstraints node ->
-        leadingExpressionIsMultiline (genType node.Type) (fun isMultiline ->
-            if isMultiline then
-                indentSepNlnUnindent (genTypeConstraints node.TypeConstraints)
-            else
-                sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genTypeConstraints node.TypeConstraints))
-        |> genNode node
+    | Type.WithGlobalConstraints node -> genType node.Type +> genTypeConstraints node.TypeConstraints |> genNode node
     | Type.LongIdent idn -> genIdentListNode idn
     | Type.AnonRecord node ->
         let genStruct =