From 690e2ea5d5b5caeaaeb06dd212c50911399ad35e Mon Sep 17 00:00:00 2001
From: liplus-lin-lay <liplus-lin-lay@users.noreply.github.com>
Date: Mon, 13 Apr 2026 20:21:30 +0900
Subject: [PATCH] fix(tabs): suppress resize_pty on tab switch to prevent CLI
 screen clear
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タブ切り替え時に fit() → onResize → resize_pty が発火し、CLI の Ink UI が
画面クリア+再描画を行うことでターミナル内容が消える問題を修正。

suppressResize フラグでタブ活性化中の resize_pty 送信を抑制。
fit() 完了後 100ms で解除し、通常のウィンドウリサイズは引き続き動作。

Refs #69

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 src/tabs.ts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/tabs.ts b/src/tabs.ts
index e6c920a..cde03a5 100644
--- a/src/tabs.ts
+++ b/src/tabs.ts
@@ -40,6 +40,7 @@ interface TabState {
   unlistenData: UnlistenFn | null;
   unlistenExit: UnlistenFn | null;
   resizeObserver: ResizeObserver | null;
+  suppressResize: boolean;
 }
 
 // ---------------------------------------------------------------------------
@@ -351,6 +352,7 @@ export class TabManager {
       unlistenData: null,
       unlistenExit: null,
       resizeObserver,
+      suppressResize: false,
     };
 
     // Register input/resize handlers ONCE per terminal (not per start)
@@ -360,7 +362,7 @@ export class TabManager {
       }
     });
     terminal.onResize(({ cols, rows }) => {
-      if (tabState.ptyId) {
+      if (tabState.ptyId && !tabState.suppressResize) {
         invoke("resize_pty", { id: tabState.ptyId, cols, rows });
       }
     });
@@ -387,14 +389,19 @@ export class TabManager {
     // Activate new
     const state = this.tabs.get(tabId);
     if (state) {
+      // Suppress resize_pty during tab activation to prevent CLI screen clear
+      state.suppressResize = true;
       state.containerEl.style.display = "flex";
       state.tabEl.classList.add("tab-active");
       this.activeTabId = tabId;
       this.updateToolbar(state);
       // Re-fit terminal after it becomes visible
-      // Use requestAnimationFrame to ensure layout is complete before fitting
       requestAnimationFrame(() => {
         state.fitAddon.fit();
+        // Re-enable resize after fit settles
+        setTimeout(() => {
+          state.suppressResize = false;
+        }, 100);
       });
     }
   }