From f56ccf5ef545432b8a18962ad1b7742ecb84aafc Mon Sep 17 00:00:00 2001
From: Hampus <hampus@fluxer.app>
Date: Mon, 24 Aug 2026 12:55:00 +0200
Subject: [PATCH] fix(app): keep tooltips inside the fullscreen element (#1968)

---
 .../ui/components/slider/useSliderTooltip.ts  | 12 ++++++++--
 .../src/features/ui/tooltip/Tooltip.tsx       | 22 +++++++++++++++++--
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/fluxer_app/src/features/ui/components/slider/useSliderTooltip.ts b/fluxer_app/src/features/ui/components/slider/useSliderTooltip.ts
index 358a918d7..337e8a1d7 100644
--- a/fluxer_app/src/features/ui/components/slider/useSliderTooltip.ts
+++ b/fluxer_app/src/features/ui/components/slider/useSliderTooltip.ts
@@ -2,7 +2,7 @@
 
 import Accessibility from '@app/features/accessibility/state/Accessibility';
 import {Logger} from '@app/features/platform/utils/AppLogger';
-import {useTooltipPortalRoot} from '@app/features/ui/tooltip/Tooltip';
+import {getFullscreenOverflowBoundary, useTooltipPortalRoot} from '@app/features/ui/tooltip/Tooltip';
 import {appZoomCssPx, appZoomLayoutPx} from '@app/features/ui/utils/AppZoomUtils';
 import {
 	getReducedMotionProps,
@@ -101,9 +101,17 @@ export function useSliderTooltip({
 				left: '-9999px',
 				top: '-9999px',
 			});
-			const middleware = [offset(8), flip(), shift({padding: 8}), arrow({element: arrowRef})];
+			const overflowBoundary = getFullscreenOverflowBoundary(target);
+			const boundaryOptions = overflowBoundary ? {boundary: overflowBoundary} : undefined;
+			const middleware = [
+				offset(8),
+				flip(boundaryOptions),
+				shift({padding: 8, ...boundaryOptions}),
+				arrow({element: arrowRef}),
+			];
 			const {x, y, middlewareData} = await computePosition(target, tooltip, {
 				placement: 'top',
+				strategy: 'fixed',
 				middleware,
 			});
 			Object.assign(tooltip.style, {
diff --git a/fluxer_app/src/features/ui/tooltip/Tooltip.tsx b/fluxer_app/src/features/ui/tooltip/Tooltip.tsx
index 0f022e7da..04b5ee513 100644
--- a/fluxer_app/src/features/ui/tooltip/Tooltip.tsx
+++ b/fluxer_app/src/features/ui/tooltip/Tooltip.tsx
@@ -26,6 +26,7 @@ import {
 	subscribeWindowHoverControlsChange,
 } from '@app/features/ui/utils/WindowFocusInteractionGuard';
 import {elementSupportsRef} from '@app/lib/react';
+import type {ExtendedDocument} from '@app/types/browser.d';
 import {FloatingPortal} from '@floating-ui/react';
 import {arrow, autoUpdate, computePosition, flip, offset, shift} from '@floating-ui/react-dom';
 import {clsx} from 'clsx';
@@ -47,6 +48,20 @@ const TOOLTIP_AUTO_UPDATE_OPTIONS = {
 	layoutShift: true,
 } as const;
 
+export const getFullscreenOverflowBoundary = (target: HTMLElement): HTMLElement | null => {
+	const ownerDocument = target.ownerDocument as ExtendedDocument;
+	const ownerWindow = ownerDocument.defaultView;
+	if (!ownerWindow) return null;
+	const fullscreenElement =
+		ownerDocument.fullscreenElement ??
+		ownerDocument.webkitFullscreenElement ??
+		ownerDocument.mozFullScreenElement ??
+		ownerDocument.msFullscreenElement ??
+		null;
+	if (!(fullscreenElement instanceof ownerWindow.HTMLElement)) return null;
+	return fullscreenElement.contains(target) ? fullscreenElement : null;
+};
+
 const tooltipPortalRoots = new WeakMap<Document, HTMLElement>();
 
 const getTooltipPortalRoot = (ownerDocument: Document): HTMLElement => {
@@ -389,14 +404,17 @@ export const Tooltip = observer(
 					left: '-9999px',
 					top: '-9999px',
 				} as CSSStyleDeclaration);
+				const overflowBoundary = getFullscreenOverflowBoundary(target);
+				const boundaryOptions = overflowBoundary ? {boundary: overflowBoundary} : undefined;
 				const middleware = [
 					offset(padding + nudge),
-					flip(),
-					shift({padding: 8}),
+					flip(boundaryOptions),
+					shift({padding: 8, ...boundaryOptions}),
 					...(arrowRef.current ? [arrow({element: arrowRef.current})] : []),
 				];
 				const {x, y, placement, middlewareData} = await computePosition(target, tooltip, {
 					placement: position,
+					strategy: 'fixed',
 					middleware,
 				});
 				if (