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Modal dialogs can be presented while other modal dialogs are already being displayed. Previously, dialogs were always displayed in the order they were requested. But say you have two untitled buffers in a pane and you close all items… You'll display prompt dialogs for both buffers asking the user if they want to save. If the user answers yes to the first dialog, they should see the path selection dialog before they see the save prompt for the second buffer. This commit uses a stack of queues to store deferred dialogs and allow dialogs presented by the dismissal of another dialog to take precedence over other pending dialogs.