Fix else block location

Author: ota-meshi

src/parser/converts/block.ts

@@ -49,7 +49,7 @@ export function convertIfBlock(
         return ifBlock
     }
 
-    const elseStart = ctx.code.lastIndexOf("{", node.else.start)
+    const elseStart = ctx.code.lastIndexOf("{", node.else.start - 1)
 
     const elseBlock: SvelteElseBlock = {
         type: "SvelteElseBlock",

tests/fixtures/parser/ast/if-block0101-input.svelte

@@ -0,0 +1 @@
+{#if expression}{:else if expression}{:else}{/if}

tests/fixtures/parser/ast/if-block0101-no-undef-result.json

@@ -0,0 +1,14 @@
+[
+  {
+    "ruleId": "no-undef",
+    "code": "expression",
+    "line": 1,
+    "column": 6
+  },
+  {
+    "ruleId": "no-undef",
+    "code": "expression",
+    "line": 1,
+    "column": 27
+  }
+]