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In the "Development Hosts Manager" dialog, "Cancel" button cancels host removal or setting host as default. But it does not cancel adding host and changing maps,
too many changes required, not in this release
Adding/removing host part is fixed
Adding host issue is solved a while ago. When synchronization or path mapping is changed, this is done in a separate dialog with its own ok/cancel buttons, so I would say the situation is ambiguous. Ideally, the dialog should be redesigned so that it does not show 2-nd level dialogs.