THE BIGGER PICTURE - Root Cause Analysis:
Problem Chain:
1. FABContext value recreated every render
2. All FAB consumers re-render
3. Dashboard re-renders
4. useFABConfig runs
5. Creates new icon/callbacks
6. Triggers FABContext update
7. INFINITE LOOP!
The Bug (in BOTH contexts):
<Context.Provider value={{ config, setFAB, clearFAB }}>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
NEW object every render!
Every time Provider re-renders:
- Creates NEW value object
- All consumers see "new" value
- All consumers re-render
- Causes more Provider re-renders
- INFINITE LOOP!
The Fix:
const setFAB = useCallback(..., []); // Stable function
const clearFAB = useCallback(..., []); // Stable function
const value = useMemo(() => ({ config, setFAB, clearFAB }), [config, setFAB, clearFAB]);
^^^^^^^
Only creates new object when dependencies actually change!
<Context.Provider value={value}>
^^^^^^^
Stable reference!
Why This is Critical:
Context is at the TOP of the component tree:
App
└─ FABProvider ← Bug here affects EVERYTHING below
└─ PageHeaderProvider ← Bug here too
└─ DashboardProvider
└─ Shell
└─ Dashboard ← Infinite re-renders
└─ Charts ← Break from constant re-renders
React Context Performance Rules:
1. ALWAYS memoize context value object
2. ALWAYS use useCallback for context functions
3. NEVER create inline objects in Provider value
4. Context updates trigger ALL consumers
Fixed Contexts:
1. FABContext - Memoized value, callbacks
2. PageHeaderContext - Memoized value, callbacks
Before:
Every render → new value object → all consumers re-render → LOOP
After:
Only config changes → new value object → consumers re-render once → done
Result:
✅ No infinite loops
✅ No unnecessary re-renders
✅ Clean console
✅ Smooth performance
✅ All features working
Files Modified:
- FABContext.tsx: Added useMemo and useCallback
- PageHeaderContext.tsx: Added useMemo and useCallback
- useFABConfig.tsx: Memoized icon and callbacks (previous fix)
- App.tsx: Fixed scroll detection with useRef (previous fix)
All infinite loop sources now eliminated!
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