Add regression test for list nesting (#19146) (#19244)

tests/format/markdown/list/issue-19146/__snapshots__/format.test.js.snap

@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`issue-19146.md - {"proseWrap":"always"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "always"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+ - foo
+   - bar
+	 - baz
+
+=====================================output=====================================
+- foo
+  - bar
+    - baz
+
+================================================================================
+`;

tests/format/markdown/list/issue-19146/format.test.js

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+runFormatTest(import.meta, ["markdown"], { proseWrap: "always" });

tests/format/markdown/list/issue-19146/issue-19146.md

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+ - foo
+   - bar
+	 - baz