From cca8fd84f27f348870f1c8a661a7ce8d394361a3 Mon Sep 17 00:00:00 2001
From: Fred Sauer <fredsa@google.com>
Date: Sun, 22 Mar 2026 10:07:58 -0700
Subject: [PATCH 1/2] Avoid unnecessary refreshDebugState

Skip unnecessary clearCurrentLine and
setCurrentLine every tick when current
PC marker does not need to be updated,
which in turn avoid unnecessary
EditorView.updateListener invocations
every tick.
---
 src/ide/views/editors.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ide/views/editors.ts b/src/ide/views/editors.ts
index cecd5394..64db0aad 100644
--- a/src/ide/views/editors.ts
+++ b/src/ide/views/editors.ts
@@ -536,10 +536,13 @@ export class SourceEditor implements ProjectView {
   }
 
   refreshDebugState(moveCursor: boolean) {
-    // TODO: only if line changed
+    var line = this.getActiveLine();
+    if (!line && !this.currentDebugLine && !moveCursor) {
+      return;
+    }
+
     // TODO: remove after compilation
     this.clearCurrentLine(moveCursor);
-    var line = this.getActiveLine();
     if (line) {
       this.setCurrentLine(line, moveCursor);
     }

From 08072b9ca08b5341d617c5a2646df89d5760714e Mon Sep 17 00:00:00 2001
From: Fred Sauer <fredsa@google.com>
Date: Sun, 22 Mar 2026 10:13:58 -0700
Subject: [PATCH 2/2] Delete redundant clearCurrentLine

Remove clearCurrentLine and conditional
check from refreshDebugState as the same
functionality is duplicated in setCurrenLine.
---
 src/ide/views/editors.ts | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/ide/views/editors.ts b/src/ide/views/editors.ts
index 64db0aad..2f241331 100644
--- a/src/ide/views/editors.ts
+++ b/src/ide/views/editors.ts
@@ -541,11 +541,7 @@ export class SourceEditor implements ProjectView {
       return;
     }
 
-    // TODO: remove after compilation
-    this.clearCurrentLine(moveCursor);
-    if (line) {
-      this.setCurrentLine(line, moveCursor);
-    }
+    this.setCurrentLine(line, moveCursor);
   }
 
   refreshListing() {