Mark hotspots + add some logs

crates/language/src/buffer.rs

@@ -1574,8 +1574,10 @@ impl Buffer {
                 self.did_finish_parsing(new_syntax_snapshot, cx);
                 self.reparse = None;
             }
+            // TODO JK hotspot
             Err(parse_task) => {
                 // todo(lw): hot foreground spawn
+                log::error!("Oops, we failed in bg, so let's try fg instead");
                 self.reparse = Some(cx.spawn(async move |this, cx| {
                     let new_syntax_map = cx.background_spawn(parse_task).await;
                     this.update(cx, move |this, cx| {

crates/language/src/syntax_map.rs

@@ -1306,6 +1306,7 @@ fn parse_text(
         parser.set_included_ranges(ranges)?;
         parser.set_language(&grammar.ts_language)?;
         parser
+            // TODO JK hotspot
             .parse_with_options(
                 &mut move |offset, _| {
                     chunks.seek(start_byte + offset);