Convert the OverlayManager
class to use private fields/methods
#14704
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Convert the
OverlayManager
class to use private fields/methodsChange
OverlayManager.open
to always error if the overlay is already activeThe old code would allow an overlay to force close itself, before immediately re-opening itself, which actually isn't very helpful in practice since that won't re-run any overlay-specific initialization code.
Given how the overlays are being used this really shouldn't have caused any issues, but it's a bug that we should fix nonetheless.