When working on a project in timeline view, the user can currently drag or extend a task into the grayed-out weekend times whereupon a dialogue box appears asking whether the intent is to schedule a task on a weekend. If "no" or "cancel" is chosen, the action of dynamically changing the time is cancelled.
In large-scale timelines that span months, quarters, or even years, the grayed-out weekends are simultaneously too small to see while also being very numerous. This presents a particular problem when one dynamically extends or moves a task in the timeline view: the user often or inevitably lands on a weekend space where the dialogue box appears asking whether the user wishes to schedule a task on a weekend. Therefore, if one is often or always landing on weekend time, it becomes far too frustrating (or impossible) to use the dynamic task adjustment in the timeline view, as the user is always cancelling the dialogue box, and therefore cancelling their intended timeline adjustment.
One possible solution is to include a button that toggles the collapse of weekends to make them unavailable for scheduling. Ref. request #465660.