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Document Firefox pause/resume edge case for scheduler work state #35466

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Document Firefox pause/resume edge case for scheduler work state #35466

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6 changes: 5 additions & 1 deletion packages/scheduler/src/forks/Scheduler.js
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Expand Up @@ -84,7 +84,11 @@ var taskIdCounter = 1;

var currentTask = null;
var currentPriorityLevel: PriorityLevel = NormalPriority;

// NOTE: In Firefox, JavaScript execution can pause due to debugger breakpoints
// or alert() calls while scheduler work is in progress.
// When execution resumes, this flag may remain set if cleanup logic
// does not run as expected, causing the scheduler to believe work
// is already in progress. See issue #17355 for context.
// This is set while performing work, to prevent re-entrance.
var isPerformingWork = false;

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