Fix wrong auto-fix in yml/block-mapping rule

src/rules/block-mapping.ts

@@ -1,7 +1,7 @@
 import type { AST } from "yaml-eslint-parser"
 import type { YAMLNodeOrToken, RuleFixer, Fix, RuleContext } from "../types"
 import { createRule } from "../utils"
-import { isComma } from "../utils/ast-utils"
+import { isColon, isComma } from "../utils/ast-utils"
 import {
     calcExpectIndentForPairs,
     hasTabIndent,
@@ -333,6 +333,15 @@ function buildFixFlowToBlock(node: AST.YAMLFlowMapping, context: RuleContext) {
                 [prevToken.range[1], pair.range[0]],
                 `\n${expectIndent}`,
             )
+            const colonToken = sourceCode.getTokenAfter(pair.key!, isColon)!
+            if (
+                colonToken.range[1] ===
+                sourceCode.getTokenAfter(colonToken, {
+                    includeComments: true,
+                })!.range[0]
+            ) {
+                yield fixer.insertTextAfter(colonToken, " ")
+            }
             yield* processIndentFix(fixer, expectIndent, pair.value!, context)
             prev = pair
         }

tests/fixtures/rules/block-mapping/invalid/flow-colon01-errors.json

@@ -0,0 +1,7 @@
+[
+    {
+        "message": "Must use block style mappings.",
+        "line": 2,
+        "column": 1
+    }
+]

tests/fixtures/rules/block-mapping/invalid/flow-colon01-input.yml

@@ -0,0 +1,4 @@
+# {}
+{
+    "a":"a","b":"b"
+}

tests/fixtures/rules/block-mapping/invalid/flow-colon01-output.yml

@@ -0,0 +1,3 @@
+# block-mapping/invalid/flow-colon01-input.yml
+    "a": "a"
+    "b": "b"