Use active window if on current workspace for fullscreen mode.

ash/wm/panels/panel_layout_manager.cc

Index: ash/wm/panels/panel_layout_manager.cc
diff --git a/ash/wm/panels/panel_layout_manager.cc b/ash/wm/panels/panel_layout_manager.cc
index f4b0bde1ba633e2ccd8875534e120249566776d9..274c8f252f403cdff3bcdc7aa019193e51ae286c 100644
--- a/ash/wm/panels/panel_layout_manager.cc
+++ b/ash/wm/panels/panel_layout_manager.cc
@@ -608,8 +608,10 @@ void PanelLayoutManager::Relayout() {
     }
 
     // If the shelf is currently hidden (full-screen mode), minimize panel until
-    // full-screen mode is exited.
-    if (restore_windows_on_shelf_visible_) {
+    // full-screen mode is exited. When a panel is dragged from another display
+    // the shelf state does not update before the panel is added so we exclude
+    // the dragged panel.
+    if (panel != dragged_panel_ && restore_windows_on_shelf_visible_) {
       wm::GetWindowState(panel)->Minimize();
       restore_windows_on_shelf_visible_->Add(panel);
       continue;