Fix not complete 'else' before tuple

Example
---
```rust
fn foo() -> (i32, i32) {
    if foo {} el$0
    (2, 3)
}
```

**Before this PR**

```rust
...
kw crate::
kw false
kw for
...
```

**After this PR**

```rust
...
kw crate::
kw else
kw else if
kw false
kw for
...
```

Author: A4-Tacks

crates/ide-completion/src/context/analysis.rs

@@ -2030,9 +2030,10 @@ fn is_after_if_expr(node: SyntaxNode) -> bool {
         Some(stmt) => stmt.syntax().clone(),
         None => node,
     };
-    let prev_sibling =
-        non_trivia_sibling(node.into(), Direction::Prev).and_then(NodeOrToken::into_node);
-    iter::successors(prev_sibling, |it| it.last_child_or_token()?.into_node())
+    let Some(prev_token) = previous_non_trivia_token(node) else { return false };
+    prev_token
+        .parent_ancestors()
+        .take_while(|it| it.text_range().end() == prev_token.text_range().end())
         .find_map(ast::IfExpr::cast)
         .is_some()
 }

crates/ide-completion/src/tests/expression.rs

@@ -2182,6 +2182,32 @@ fn foo() { match () { () => if foo {} $0, _ => (), } }
             kw ref
         "#]],
     );
+    check(
+        r#"
+fn foo() -> (i32, i32) { if foo {} el$0 (2, 3) }
+"#,
+        expect![[r#"
+            fn foo fn() -> (i32, i32)
+            bt u32                u32
+            kw const
+            kw crate::
+            kw else
+            kw else if
+            kw false
+            kw for
+            kw if
+            kw if let
+            kw loop
+            kw match
+            kw return
+            kw self::
+            kw true
+            kw unsafe
+            kw while
+            kw while let
+            ex foo()
+        "#]],
+    );
     // FIXME: support else completion after ast::RecordExprField
 }