webui: minor settings reorganization and add disable autoscroll option

tools/server/webui/src/lib/components/app/chat/ChatScreen/ChatScreen.svelte

@@ -29,6 +29,7 @@
 		sendMessage,
 		stopGeneration
 	} from '$lib/stores/chat.svelte';
+	import { config } from '$lib/stores/settings.svelte';
 	import {
 		supportsVision,
 		supportsAudio,
@@ -47,6 +48,7 @@
 
 	let { showCenteredEmpty = false } = $props();
 
+	let disableAutoScroll = $derived(Boolean(config().disableAutoScroll));
 	let autoScrollEnabled = $state(true);
 	let chatScrollContainer: HTMLDivElement | undefined = $state();
 	let dragCounter = $state(0);
@@ -149,7 +151,7 @@
 	}
 
 	function handleScroll() {
-		if (!chatScrollContainer) return;
+		if (disableAutoScroll || !chatScrollContainer) return;
 
 		const { scrollTop, scrollHeight, clientHeight } = chatScrollContainer;
 		const distanceFromBottom = scrollHeight - scrollTop - clientHeight;
@@ -194,8 +196,10 @@
 		const extras = result?.extras;
 
 		// Enable autoscroll for user-initiated message sending
-		userScrolledUp = false;
-		autoScrollEnabled = true;
+		if (!disableAutoScroll) {
+			userScrolledUp = false;
+			autoScrollEnabled = true;
+		}
 		await sendMessage(message, extras);
 		scrollChatToBottom();
 
@@ -241,21 +245,36 @@
 	}
 
 	function scrollChatToBottom(behavior: ScrollBehavior = 'smooth') {
+		if (disableAutoScroll) return;
+
 		chatScrollContainer?.scrollTo({
 			top: chatScrollContainer?.scrollHeight,
 			behavior
 		});
 	}
 
 	afterNavigate(() => {
-		setTimeout(() => scrollChatToBottom('instant'), INITIAL_SCROLL_DELAY);
+		if (!disableAutoScroll) {
+			setTimeout(() => scrollChatToBottom('instant'), INITIAL_SCROLL_DELAY);
+		}
 	});
 
 	onMount(() => {
-		setTimeout(() => scrollChatToBottom('instant'), INITIAL_SCROLL_DELAY);
+		if (!disableAutoScroll) {
+			setTimeout(() => scrollChatToBottom('instant'), INITIAL_SCROLL_DELAY);
+		}
 	});
 
 	$effect(() => {
+		if (disableAutoScroll) {
+			autoScrollEnabled = false;
+			if (scrollInterval) {
+				clearInterval(scrollInterval);
+				scrollInterval = undefined;
+			}
+			return;
+		}
+
 		if (isCurrentConversationLoading && autoScrollEnabled) {
 			scrollInterval = setInterval(scrollChatToBottom, AUTO_SCROLL_INTERVAL);
 		} else if (scrollInterval) {
@@ -289,9 +308,11 @@
 			class="mb-16 md:mb-24"
 			messages={activeMessages()}
 			onUserAction={() => {
-				userScrolledUp = false;
-				autoScrollEnabled = true;
-				scrollChatToBottom();
+				if (!disableAutoScroll) {
+					userScrolledUp = false;
+					autoScrollEnabled = true;
+					scrollChatToBottom();
+				}
 			}}
 		/>
 

tools/server/webui/src/lib/components/app/chat/ChatSettings/ChatSettings.svelte

@@ -3,7 +3,6 @@
 		Settings,
 		Funnel,
 		AlertTriangle,
-		Brain,
 		Code,
 		Monitor,
 		Sun,
@@ -58,6 +57,33 @@
 					label: 'Paste long text to file length',
 					type: 'input'
 				},
+				{
+					key: 'enableContinueGeneration',
+					label: 'Enable "Continue" button',
+					type: 'checkbox',
+					isExperimental: true
+				},
+				{
+					key: 'pdfAsImage',
+					label: 'Parse PDF as image',
+					type: 'checkbox'
+				},
+				{
+					key: 'askForTitleConfirmation',
+					label: 'Ask for confirmation before changing conversation title',
+					type: 'checkbox'
+				}
+			]
+		},
+		{
+			title: 'Display',
+			icon: Monitor,
+			fields: [
+				{
+					key: 'showThoughtInProgress',
+					label: 'Show thought in progress',
+					type: 'checkbox'
+				},
 				{
 					key: 'showMessageStats',
 					label: 'Show message generation statistics',
@@ -79,25 +105,14 @@
 					type: 'checkbox'
 				},
 				{
-					key: 'enableContinueGeneration',
-					label: 'Enable "Continue" button',
-					type: 'checkbox',
-					isExperimental: true
-				},
-				{
-					key: 'pdfAsImage',
-					label: 'Parse PDF as image',
+					key: 'disableAutoScroll',
+					label: 'Disable automatic scroll',
 					type: 'checkbox'
 				},
 				{
 					key: 'renderUserContentAsMarkdown',
 					label: 'Render user content as Markdown',
 					type: 'checkbox'
-				},
-				{
-					key: 'askForTitleConfirmation',
-					label: 'Ask for confirmation before changing conversation title',
-					type: 'checkbox'
 				}
 			]
 		},
@@ -208,17 +223,6 @@
 				}
 			]
 		},
-		{
-			title: 'Reasoning',
-			icon: Brain,
-			fields: [
-				{
-					key: 'showThoughtInProgress',
-					label: 'Show thought in progress',
-					type: 'checkbox'
-				}
-			]
-		},
 		{
 			title: 'Import/Export',
 			icon: Database,

tools/server/webui/src/lib/constants/settings-config.ts

@@ -14,6 +14,7 @@ export const SETTING_CONFIG_DEFAULT: Record<string, string | number | boolean> =
 	pasteLongTextToFileLen: 2500,
 	pdfAsImage: false,
 	showModelInfo: false,
+	disableAutoScroll: false,
 	renderUserContentAsMarkdown: false,
 	modelSelectorEnabled: false,
 	// make sure these default values are in sync with `common.h`
@@ -93,6 +94,8 @@ export const SETTING_CONFIG_INFO: Record<string, string> = {
 		'Ask for confirmation before automatically changing conversation title when editing the first message.',
 	pdfAsImage: 'Parse PDF as image instead of text (requires vision-capable model).',
 	showModelInfo: 'Display the model name used to generate each message below the message content.',
+	disableAutoScroll:
+		'Disable automatic scrolling while messages stream so you can control the viewport position manually.',
 	renderUserContentAsMarkdown: 'Render user messages using markdown formatting in the chat.',
 	modelSelectorEnabled:
 		'Enable the model selector in the chat input to choose the inference model. Sends the associated model field in API requests.',