When selecting a version of a tile overlay, don't remove the previously selected layer or add the newly selected layer unless the parent's checkbox is checked. (If the parent's checkbox is unchecked, the previously selected layer should already have been removed.)
When selecting a version of a tile overlay, don't remove the previously selected layer
or add the newly selected layer unless the parent's checkbox is checked. (If the parent's
checkbox is unchecked, the previously selected layer should already have been removed.)

Also, when clicking the name/label of a tile overlay that has versions, don't check or
uncheck the checkbox. Just open/close the version submenu.

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