Fix unstable yaml print (#8355)

changelog_unreleased/yaml/pr-8355.md

@@ -0,0 +1,34 @@
+#### Fix unstable format with `prettier-ignore` ([#8355](https://github.com/prettier/prettier/pull/8355) by [@fisker](https://github.com/fisker))
+
+<!-- prettier-ignore -->
+```yaml
+# Input
+# prettier-ignore
+---
+prettier: true
+...
+hello: world
+
+# Prettier stable
+# prettier-ignore
+---
+prettier: true
+---
+hello: world
+
+# Prettier stable (Second format)
+# prettier-ignore
+---
+prettier: true
+
+---
+hello: world
+
+# Prettier master
+# prettier-ignore
+---
+prettier: true
+---
+hello: world
+
+```

src/language-yaml/printer-yaml.js

@@ -107,10 +107,9 @@ function genericPrint(path, options, print) {
     hasPrettierIgnore(path)
       ? concat(
           replaceEndOfLineWith(
-            options.originalText.slice(
-              node.position.start.offset,
-              node.position.end.offset
-            ),
+            options.originalText
+              .slice(node.position.start.offset, node.position.end.offset)
+              .trimEnd(),
             literalline
           )
         )

tests_config/run_spec.js

@@ -39,7 +39,6 @@ const unstableTests = new Map(
       (options) => options.proseWrap === "always",
     ],
     ["js/no-semi/comments.js", (options) => options.semi === false],
-    "yaml/prettier-ignore/document.yml",
   ].map((fixture) => {
     const [file, isUnstable = () => true] = Array.isArray(fixture)
       ? fixture