Markdown: fix incorrect prettification of multi-line markdown footnote (#7203)

* fix incorrect prettification of multi-line markdown footnote

* update test of footnoteDefinition

* add changelog_unreleased pr-7203

* fix changelog_unreleased

* fix pointed out

* update snapshot test of markdown for footnote

changelog_unreleased/markdown/pr-7203.md

@@ -0,0 +1,26 @@
+#### Fix incorrect prettification of multi-line markdown footnote ([#7203](https://github.com/prettier/prettier/pull/7203) by [@sasurau4](https://github.com/sasurau4))
+
+<!-- prettier-ignore -->
+```md
+<!-- Input -->
+Here's a statement[^footnote].
+
+[^footnote]:
+    Here's a multi-line footnote walking back the above statement, and showing
+    how it's all totally bollocks.
+
+<!-- Prettier stable -->
+Here's a statement[^footnote].
+
+[^footnote]:
+
+  Here's a multi-line footnote walking back the above statement, and showing
+  how it's all totally bollocks.
+
+<!-- Prettier master -->
+Here's a statement[^footnote].
+
+[^footnote]:
+  Here's a multi-line footnote walking back the above statement, and showing
+  how it's all totally bollocks.
+```

src/language-markdown/printer-markdown.js

@@ -371,12 +371,11 @@ function genericPrint(path, options, print) {
                 align(
                   " ".repeat(options.tabWidth),
                   printChildren(path, options, print, {
-                    processor: (childPath, index) =>
-                      index === 0
-                        ? group(
-                            concat([softline, softline, childPath.call(print)])
-                          )
-                        : childPath.call(print)
+                    processor: (childPath, index) => {
+                      return index === 0
+                        ? group(concat([softline, childPath.call(print)]))
+                        : childPath.call(print);
+                    }
                   })
                 ),
                 nextNode && nextNode.type === "footnoteDefinition"

tests/markdown_footnoteDefinition/__snapshots__/jsfmt.spec.js.snap

@@ -13,12 +13,10 @@ proseWrap: "always"
 
 =====================================output=====================================
 [^hello]:
-
   this is a long long long long long long long long long long long long long
   paragraph.
 
 [^world]:
-
   this is a long long long long long long long long long long long long long
   paragraph. this is a long long long long long long long long long long long
   long long paragraph.
@@ -58,7 +56,6 @@ proseWrap: "preserve"
 =====================================output=====================================
 [^hello]: this is a long long long long long long long long long long long long long paragraph.
 [^world]:
-
   this is a long long long long long long long long long long long long long paragraph.
   this is a long long long long long long long long long long long long long paragraph.
 
@@ -98,7 +95,6 @@ proseWrap: "always"
 
 =====================================output=====================================
 [^fn1]:
-
   > \`\`\`rs
   > fn main() {
   >     println!("this is some Rust!");
@@ -114,7 +110,6 @@ proseWrap: "always"
   \`\`\`
 
 [^fn2]:
-
   Here is a footnote which includes code. Here is a footnote which includes
   code. Here is a footnote which includes code.
 
@@ -160,7 +155,6 @@ proseWrap: "never"
 
 =====================================output=====================================
 [^fn1]:
-
   > \`\`\`rs
   > fn main() {
   >     println!("this is some Rust!");
@@ -176,7 +170,6 @@ proseWrap: "never"
   \`\`\`
 
 [^fn2]:
-
   Here is a footnote which includes code. Here is a footnote which includes code. Here is a footnote which includes code.
 
   \`\`\`rs
@@ -221,7 +214,6 @@ proseWrap: "preserve"
 
 =====================================output=====================================
 [^fn1]:
-
   > \`\`\`rs
   > fn main() {
   >     println!("this is some Rust!");
@@ -237,7 +229,6 @@ proseWrap: "preserve"
   \`\`\`
 
 [^fn2]:
-
   Here is a footnote which includes code. Here is a footnote which includes code. Here is a footnote which includes code.
 
   \`\`\`rs
@@ -297,13 +288,11 @@ proseWrap: "always"
 [^a]: a
 [^a]: a
 [^a]:
-
   > 123\\
   > 456
 
 [^a]: a
 [^a]:
-
   > 123\\
   > 456
 
@@ -362,13 +351,11 @@ proseWrap: "never"
 [^a]: a
 [^a]: a
 [^a]:
-
   > 123\\
   > 456
 
 [^a]: a
 [^a]:
-
   > 123\\
   > 456
 
@@ -427,13 +414,11 @@ proseWrap: "preserve"
 [^a]: a
 [^a]: a
 [^a]:
-
   > 123\\
   > 456
 
 [^a]: a
 [^a]:
-
   > 123\\
   > 456