LibGUI+FileManager: Add GAbstractView::on_selection_change hook

This hook will be called whenever the view's selection changes somehow.
Use this in the FileManager to keep the left and right views in sync.

1 files changed, 1 insertions, 0 deletions

diff --git a/Libraries/LibGUI/GAbstractView.h b/Libraries/LibGUI/GAbstractView.h
index 35c569fad6..04496027e5 100644
--- a/Libraries/LibGUI/GAbstractView.h
+++ b/Libraries/LibGUI/GAbstractView.h
@@ -36,6 +36,7 @@ public:
     void set_activates_on_selection(bool b) { m_activates_on_selection = b; }
     bool activates_on_selection() const { return m_activates_on_selection; }
 
+    Function<void()> on_selection_change;
     Function<void(const GModelIndex&)> on_activation;
     Function<void(const GModelIndex&)> on_selection;
     Function<void(const GModelIndex&, const GContextMenuEvent&)> on_context_menu_request;