Move lock checks to CLIENT_SELECTION_FILTER.

Also checks render item visibility as well as layer visibility
when making selections.

Fixes: lp:1066220
* https://bugs.launchpad.net/kicad/+bug/1066220

Fixes: lp:1541756
* https://bugs.launchpad.net/kicad/+bug/1541756

common/widgets/net_selector.cpp

@@ -262,11 +262,13 @@ NET_SELECTOR::NET_SELECTOR( wxWindow *parent, wxWindowID id,
         m_netSelectorPopup( nullptr )
 { }
 
+
 void NET_SELECTOR::DoSetPopupControl( wxComboPopup* aPopup )
 {
     m_popup = nullptr;
 }
 
+
 void NET_SELECTOR::OnButtonClick()
 {
     wxRect    comboRect = GetScreenRect();
@@ -287,11 +289,13 @@ void NET_SELECTOR::OnButtonClick()
         SetSelectedNetcode( popup->GetSelectedNetcode() );
 }
 
+
 void NET_SELECTOR::SetNetInfo( NETINFO_LIST* aNetInfoList )
 {
     m_netinfoList = aNetInfoList;
 }
 
+
 void NET_SELECTOR::SetSelectedNetcode( int aNetcode )
 {
     m_netcode = aNetcode;
@@ -311,17 +315,20 @@ void NET_SELECTOR::SetSelectedNetcode( int aNetcode )
     }
 }
 
+
 void NET_SELECTOR::SetIndeterminate()
 {
     m_netcode = -1;
     SetValue( INDETERMINATE );
 }
 
+
 bool NET_SELECTOR::IsIndeterminate()
 {
     return m_netcode == -1;
 }
 
+
 int NET_SELECTOR::GetSelectedNetcode()
 {
     return m_netcode;