From 8aa22cd2553f8c8b824ff37ee98b10eb860806a2 Mon Sep 17 00:00:00 2001
From: nntrivi2001 <vinnt@smartgift.vn>
Date: Wed, 19 Aug 2026 10:05:18 +0700
Subject: [PATCH] fix(run): enable tmux mouse mode so the run terminal's
 scrollbar actually drags
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Session panes had a scrollbar track but no way to drag it — wheel/drag
events passed straight to the running program instead of entering tmux's
copy-mode scrollback. xterm.js already forwards mouse-tracking escapes
once tmux advertises them, so turning mouse mode on per-session is enough.
---
 server/__tests__/tmux.test.js | 1 +
 server/lib/tmux.js            | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/server/__tests__/tmux.test.js b/server/__tests__/tmux.test.js
index 951fc23..146bcdf 100644
--- a/server/__tests__/tmux.test.js
+++ b/server/__tests__/tmux.test.js
@@ -47,6 +47,7 @@ describe("tmux wrapper", () => {
       "--model",
       "opus",
     ]);
+    assert.deepEqual(calls[1], ["set-option", "-t", "ccam-lane-1", "mouse", "on"]);
   });
 
   it("killSession never throws when the session is already gone", () => {
diff --git a/server/lib/tmux.js b/server/lib/tmux.js
index 9f1336c..b6fe237 100644
--- a/server/lib/tmux.js
+++ b/server/lib/tmux.js
@@ -40,6 +40,11 @@ function hasSession(name) {
  */
 function newSession({ name, cwd, argv }) {
   execImpl(["new-session", "-d", "-s", name, "-c", cwd, "--", ...argv]);
+  // Without this the pane has no scrollbar/drag scroll at all — wheel events
+  // just pass through to the running program instead of entering tmux's own
+  // copy-mode scrollback. xterm.js forwards tmux's mouse-tracking escapes
+  // automatically once mouse mode is on, so no client-side change is needed.
+  execImpl(["set-option", "-t", name, "mouse", "on"]);
 }
 
 /**