Fix trailing whitespace after class (#442)

src/printer.ts

@@ -1369,7 +1369,10 @@ export class PugPrinter {
         { result: this.result, val, length: val.length },
         this.currentLineLength,
       );
-      if (this.nextToken?.type === 'text') {
+      if (
+        this.nextToken?.type === 'text' &&
+        !/^\s+$/.test(this.nextToken.val)
+      ) {
         this.currentLineLength += 1;
         this.result += ' ';
       }
@@ -1487,7 +1490,8 @@ export class PugPrinter {
     let val: string = token.val;
     let needsTrailingWhitespace: boolean = false;
 
-    let endsWithWhitespace: boolean = val[val.length - 1] === ' ';
+    let endsWithWhitespace: boolean =
+      val[val.length - 1] === ' ' && !/^\s+$/.test(val);
 
     if (this.pipelessText) {
       switch (this.previousToken?.type) {

tests/issues/issue-439/formatted.pug

@@ -0,0 +1,6 @@
+html
+  body
+    .wrapper
+      .container Content
+    .wrapper
+      .container Content

tests/issues/issue-439/issue-439.test.ts

@@ -0,0 +1,9 @@
+import { compareFiles } from 'tests/common';
+import { describe, expect, it } from 'vitest';
+
+describe('Issues', () => {
+  it('should handle trailing whitespace after class', () => {
+    const { expected, actual } = compareFiles(__dirname);
+    expect(actual).toBe(expected);
+  });
+});

tests/issues/issue-439/unformatted.pug

@@ -0,0 +1,6 @@
+html
+  body
+    .wrapper 
+      .container Content
+    .wrapper  
+      .container Content