Selection center is center of visible items.

Fixes https://gitlab.com/kicad/code/kicad/issues/6188

eeschema/tools/ee_selection.cpp

@@ -23,8 +23,9 @@
  */
 
 #include <tools/ee_selection.h>
-
 #include <sch_item.h>
+#include <sch_component.h>
+#include <sch_sheet.h>
 
 
 EE_SELECTION::EE_SELECTION( SCH_SCREEN* aScreen ) :
@@ -58,6 +59,24 @@ EDA_ITEM* EE_SELECTION::GetTopLeftItem( bool onlyModules ) const
 }
 
 
+EDA_RECT EE_SELECTION::GetBoundingBox() const
+{
+    EDA_RECT bbox;
+
+    for( EDA_ITEM* item : m_items )
+    {
+        if( item->Type() == SCH_COMPONENT_T )
+            bbox.Merge( static_cast<SCH_COMPONENT*>( item )->GetBoundingBox( false ) );
+        else if( item->Type() == SCH_SHEET_T )
+            bbox.Merge( static_cast<SCH_SHEET*>( item )->GetBodyBoundingBox() );
+        else
+            bbox.Merge( item->GetBoundingBox() );
+    }
+
+    return bbox;
+}
+
+
 bool EE_SELECTION::AllItemsHaveLineStroke() const
 {
     for( const EDA_ITEM* item : m_items )

eeschema/tools/ee_selection.h

@@ -43,6 +43,8 @@ public:
 
     EDA_ITEM* GetTopLeftItem( bool onlyModules = false ) const override;
 
+    EDA_RECT GetBoundingBox() const override;
+
     void SetScreen( SCH_SCREEN* aScreen ) { m_screen = aScreen; }
     SCH_SCREEN* GetScreen() { return m_screen; }
 

include/tool/selection.h

@@ -33,7 +33,6 @@
 #include <eda_item.h>
 #include <view/view_group.h>
 
-
 class SELECTION : public KIGFX::VIEW_GROUP
 {
 public:
@@ -153,17 +152,12 @@ public:
         return static_cast<VECTOR2I>( GetBoundingBox().GetPosition() );
     }
 
-    EDA_RECT GetBoundingBox() const
+    virtual EDA_RECT GetBoundingBox() const
     {
         EDA_RECT bbox;
 
-        if( Front() )
-        {
-            bbox = Front()->GetBoundingBox();
-
-            for( auto i = m_items.begin() + 1; i != m_items.end(); ++i )
-                bbox.Merge( (*i)->GetBoundingBox() );
-        }
+        for( EDA_ITEM* item : m_items )
+            bbox.Merge( item->GetBoundingBox() );
 
         return bbox;
     }