dev: check previous syntax first for show/set syntax (#859)

crates/tinymist-query/src/fixtures/completion/set_in_show.typ

@@ -0,0 +1,5 @@
+/// contains: raw, read, raw.with, raw.where, read.with, read.where, replacement, red
+#show figure: it => {
+  set /* range 0..1 */
+  it
+}

crates/tinymist-query/src/fixtures/completion/snaps/test@set_in_show.typ.snap

@@ -0,0 +1,33 @@
+---
+source: crates/tinymist-query/src/completion.rs
+description: Completion on / (114..115)
+expression: "JsonRepr::new_pure(results)"
+input_file: crates/tinymist-query/src/fixtures/completion/set_in_show.typ
+---
+[
+ {
+  "isIncomplete": false,
+  "items": [
+   {
+    "kind": 3,
+    "label": "raw",
+    "labelDetails": {
+     "description": "(str, align: alignment, block: bool, lang: none | str, syntaxes: [syntax], tab-size: int, theme: [theme]) => raw"
+    },
+    "textEdit": {
+     "newText": "raw(${1:})",
+     "range": {
+      "end": {
+       "character": 6,
+       "line": 2
+      },
+      "start": {
+       "character": 6,
+       "line": 2
+      }
+     }
+    }
+   }
+  ]
+ }
+]

crates/tinymist-query/src/upstream/complete/ext.rs

@@ -120,8 +120,8 @@ impl<'a> CompletionContext<'a> {
     }
 
     fn surrounding_syntax(&mut self) -> SurroundingSyntax {
-        check_surrounding_syntax(&self.leaf)
-            .or_else(|| check_previous_syntax(&self.leaf))
+        check_previous_syntax(&self.leaf)
+            .or_else(|| check_surrounding_syntax(&self.leaf))
             .unwrap_or(SurroundingSyntax::Regular)
     }