fix(BlockList): fix race condition in BlockList

[draedful]

Fixes race conditions in the BlocksList component and scheduler system that prevented HTML blocks from rendering when tabs were opened in the background or when debounced functions were called recursively.

1. Background Tab Rendering Issue

When a browser tab was opened in the background, HTML blocks would not render until the user interacted with the page. This was caused by browsers pausing or throttling requestAnimationFrame calls in inactive tabs.

Solution

• Added listener for the visibilitychange event in GlobalScheduler
• When a tab becomes visible, immediately triggers performUpdate() if the scheduler is running

2. Race Condition in debounce/throttle

When a debounced or throttled function triggered new calls to itself during execution, the state management could lead to conflicts due to incorrect operation ordering.

Solution

• Save removeScheduler reference

3. Performance Optimization (BlocksList.tsx)

Replaced lodash.isEqual + sort with Set-based comparison for better performance on small to medium lists (10-100 blocks).

Performance gains (see benchmarks):

• 10 blocks: ~2x faster
• 50 blocks: ~3x faster
• 100 blocks: ~4x faster

[gravity-ui-bot]

Preview is ready.