Merge a21d48de54 into ba391f5fdf

packages/compiler-core/__tests__/__snapshots__/parse.spec.ts.snap

@@ -7,7 +7,26 @@ exports[`compiler: parse > Edge Cases > invalid html 1`] = `
     {
       "children": [
         {
-          "children": [],
+          "children": [
+            {
+              "content": " ",
+              "loc": {
+                "end": {
+                  "column": 1,
+                  "line": 3,
+                  "offset": 13,
+                },
+                "source": "
+",
+                "start": {
+                  "column": 7,
+                  "line": 2,
+                  "offset": 12,
+                },
+              },
+              "type": 2,
+            },
+          ],
           "codegenNode": undefined,
           "loc": {
             "end": {

packages/compiler-core/__tests__/parse.spec.ts

@@ -2371,6 +2371,12 @@ describe('compiler: parse', () => {
       expect((ast.children[0] as TextNode).content).toBe(` foo bar baz `)
     })
 
+    // #7789
+    test('should condense consecutive whitespaces in texts full of whitespaces', () => {
+      const ast = parse(`          `)
+      expect((ast.children[0] as TextNode).content).toBe(` `)
+    })
+
     test('should remove leading newline character immediately following the pre element start tag', () => {
       const ast = parse(`<pre>\n  foo  bar  </pre>`, {
         isPreTag: tag => tag === 'pre',
@@ -2488,6 +2494,13 @@ describe('compiler: parse', () => {
       const ast = parse(content)
       expect((ast.children[0] as TextNode).content).toBe(content)
     })
+
+    // #7789
+    test('should preserve consecutive whitespaces in texts full of whitespaces', () => {
+      const whitespaces = '           '
+      const ast = parse(`${whitespaces}`)
+      expect((ast.children[0] as TextNode).content).toBe(whitespaces)
+    })
   })
 
   describe('expression parsing', () => {

packages/compiler-core/src/parser.ts

@@ -839,7 +839,8 @@ function condenseWhitespace(nodes: TemplateChildNode[]): TemplateChildNode[] {
     const node = nodes[i]
     if (node.type === NodeTypes.TEXT) {
       if (!inPre) {
-        if (isAllWhitespace(node.content)) {
+        // #7789
+        if (isAllWhitespace(node.content) && nodes.length > 1) {
           const prev = nodes[i - 1] && nodes[i - 1].type
           const next = nodes[i + 1] && nodes[i + 1].type
           // Remove if:

packages/compiler-ssr/__tests__/ssrTransitionGroup.spec.ts

@@ -132,8 +132,7 @@ describe('transition-group', () => {
   test('attribute fallthrough', () => {
     expect(
       compile(
-        `<transition-group tag="ul" class="red" id="ok">
+        `<transition-group tag="ul" class="red" id="ok"></transition-group>`,
-        </transition-group>`,
       ).code,
     ).toMatchInlineSnapshot(`
       "const { mergeProps: _mergeProps } = require("vue")