From 5ae2ccefb8fb403ae4359652aaf99e9231a3d3ce Mon Sep 17 00:00:00 2001
From: Tao Hu <73904+hut36@users.noreply.github.com>
Date: Thu, 9 Apr 2026 18:49:06 +0800
Subject: [PATCH] fix(#171): focus on textarea on switching back to writing tab

---
 .../carta-md/src/lib/internal/components/Input.svelte | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/packages/carta-md/src/lib/internal/components/Input.svelte b/packages/carta-md/src/lib/internal/components/Input.svelte
index 01b1ed0d..f85b4daa 100644
--- a/packages/carta-md/src/lib/internal/components/Input.svelte
+++ b/packages/carta-md/src/lib/internal/components/Input.svelte
@@ -62,6 +62,7 @@
 	let highlightElem: HTMLDivElement;
 	let wrapperElem: HTMLDivElement;
 	let currentlyHighlightedValue = value;
+	let wasHidden = $state(hidden);
 
 	const simpleUUID = Math.random().toString(36).substring(2);
 
@@ -71,6 +72,7 @@
 	 */
 	export const resize = () => {
 		if (!mounted || !textarea) return;
+
 		textarea.style.height = '0';
 		textarea.style.minHeight = '0';
 		textarea.style.height = textarea.scrollHeight + 'px';
@@ -201,6 +203,15 @@
 		}
 	});
 
+	$effect(() => {
+		if (hidden) {
+			wasHidden = true;
+		} else if (wasHidden && mounted) {
+			wasHidden = false;
+			queueMicrotask(focus);
+		}
+	});
+
 	/**
 	 * Mount callback
 	 */