fix(editor): handle trailing comments in SQL ranges

apps/desktop/src/lib/__tests__/sql/sqlStatementRanges.spec.ts

@@ -584,6 +584,43 @@ GET /_cat/indices`;
     expect(range?.sql.trim()).toBe("SELECT *\nFROM system_dept");
   });
 
+  it("returns the previous statement when the cursor sits after a trailing line comment behind its semicolon", () => {
+    // 复现场景：每条语句以 `; -- 备注` 结尾，光标停在第一条的行尾注释之后
+    const sql = "SELECT T.*,T.ROWID FROM offer t WHERE t.offer_name = 'V3 Red Mi'; -- 114808\nSELECT T.*,T.ROWID FROM offer t WHERE t.offer_name = 'Emery Mann-6264-postpaid-2'; -- 127923";
+    const pos = sql.indexOf("\n");
+    const range = statementRangeAtCursor(sql, pos, "oracle");
+    expect(range?.sql).toBe("SELECT T.*,T.ROWID FROM offer t WHERE t.offer_name = 'V3 Red Mi'");
+  });
+
+  it("returns the current statement when the cursor is inside the trailing line comment", () => {
+    const sql = "SELECT 1; -- 114808\nSELECT 2; -- 127923";
+    const pos = sql.indexOf("114808") + 2;
+    const range = statementRangeAtCursor(sql, pos);
+    expect(range?.sql.trim()).toBe("SELECT 1");
+  });
+
+  it("returns the current statement when the cursor is after a trailing block comment behind its semicolon", () => {
+    const sql = "SELECT 1; /* 备注 */\nSELECT 2;";
+    const pos = sql.indexOf("\n");
+    const range = statementRangeAtCursor(sql, pos);
+    expect(range?.sql.trim()).toBe("SELECT 1");
+  });
+
+  it("returns the current statement after a multiline trailing block comment", () => {
+    const sql = "SELECT 1; /* 第一行\n第二行 */\nSELECT 2;";
+    const pos = sql.indexOf("*/") + 2;
+    const range = statementRangeAtCursor(sql, pos);
+    expect(range?.sql.trim()).toBe("SELECT 1");
+  });
+
+  it("still returns the next statement when the cursor is at the start of its line after a trailing comment", () => {
+    // 回归：换行后的光标不再归属上一条语句
+    const sql = "SELECT 1; -- 114808\nSELECT 2; -- 127923";
+    const pos = sql.indexOf("SELECT 2");
+    const range = statementRangeAtCursor(sql, pos);
+    expect(range?.sql.trim()).toBe("SELECT 2");
+  });
+
   it("keeps a semicolon-line-end cursor on the current multi-line statement", () => {
     const sql = "SELECT *\nFROM system_dept;";
     const gapPos = sql.indexOf(";") + 1;

apps/desktop/src/lib/sql/statementDelimiter.ts

@@ -24,7 +24,49 @@ export function cursorBelongsToTrailingStatementDelimiter(source: StatementDelim
   if (cursorPos <= delimiterPos + 1) return true;
 
   const afterDelimiter = sliceSource(source, delimiterPos + 1, cursorPos);
-  return !afterDelimiter.includes("\n") && afterDelimiter.trim() === "";
+  // 分号到光标之间允许是空白或尾部注释（如 `SELECT 1; -- 备注`），
+  // 块注释自身可以跨行，但注释之外的换行仍表示光标已进入下一行
+  // 否则行尾注释后的光标会被下一条语句的前置区域错误认领
+  return trailingGapIsWhitespaceOrComment(afterDelimiter);
+}
+
+/**
+ * 判断语句分号与光标之间的间隙是否只包含空白和注释。
+ * 块注释内部允许换行；注释之外的换行表示光标已离开分号所在行。
+ */
+function trailingGapIsWhitespaceOrComment(gap: string): boolean {
+  let i = 0;
+  while (i < gap.length) {
+    const ch = gap[i] ?? "";
+    const next = gap[i + 1] ?? "";
+
+    // 普通空白直接跳过
+    if (ch === " " || ch === "\t" || ch === "\r") {
+      i += 1;
+      continue;
+    }
+
+    if (ch === "\n") return false;
+
+    // 行注释：`--`（SQL 标准）或 `//`（MongoDB shell），其后内容直到行尾都是注释
+    if ((ch === "-" && next === "-") || (ch === "/" && next === "/")) return true;
+
+    // `#` 行注释（MySQL 等），但 `#{` 是 MyBatis 参数语法，不是注释
+    if (ch === "#" && next !== "{") return true;
+
+    // 块注释 /* ... */：跳过整段后继续检查剩余间隙
+    if (ch === "/" && next === "*") {
+      const close = gap.indexOf("*/", i + 2);
+      // 未闭合的块注释：剩余部分全部视为注释
+      if (close === -1) return true;
+      i = close + 2;
+      continue;
+    }
+
+    // 出现其他实际内容，说明光标后面还有语句文本，不能归属上一条语句
+    return false;
+  }
+  return true;
 }
 
 function sliceSource(source: StatementDelimiterSource, from: number, to: number): string {