dfa9f92e531bd08170afb9c69fb9f79f832722ea
The initial calls in `we_have_dependents()` was redundantly setting all widows to "Hidden", before the actual state was known. tabbable_state_change() is initially called for all Tabs: ARDOUR_UI::setup_windows -> add_to_notebook() -> attach(), or for detached windows Tabbable::set_state() -> hide_tab(). Step_up/down_through_tabs used window visibility to determine candidates. This incorrectly considered detached visible tabs. Detached windows cannot be cycled to. This also addressed an issue where tab-buttons state was incorrectly unset what unrelated tab state changed. ImplicitActive of the currently active tab is now retained when some other window is attached/detached.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html
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