Fix Eeschema find item bugs and other minor changes.

* Fix bug in hierarchical searches using sheet path pointers which are
  destroyed on every search.  Use human readable path as last sheet found
  in test to prevent comparison of deleted pointers.
* Fix a bug in SCH_COMPONENT::Matches() that would prevent searching for
  pins if the search all fields flags was not set.
* Fix a bug in SCH_COMPONENT::Matches() to use the sheet path to perform
  the comparison to the correct reference designator and unit number.
* Fix wrapping in sheet path and sheet path list MatchNextItem methods.
* Push search methods down to EDA_ITEM object so advanced searching can
  be performed on all items derived from EDA_ITEM.
* Add virtual method to EDA_ITEM object to test if item supports replacing
  text.
* Replace switch statement magic numbers in Eeschema socket connection code
  with Pcbnew for improved readability.

common/base_struct.cpp

@@ -1,3 +1,28 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2004 Jean-Pierre Charras, [email protected]
+ * Copyright (C) 2008-20011 Wayne Stambaugh <[email protected]>
+ * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
 /**
  * @file base_struct.cpp
  * @brief Implementation of EDA_ITEM and EDA_TEXT base classes for KiCad.
@@ -13,6 +38,8 @@
 #include "class_base_screen.h"
 #include "drawtxt.h"
 
+#include "../eeschema/dialogs/dialog_schematic_find.h"
+
 
 enum textbox {
     ID_TEXTBOX_LIST = 8010
@@ -133,6 +160,33 @@ wxString EDA_ITEM::GetSelectMenuText() const
 }
 
 
+bool EDA_ITEM::Matches( const wxString& aText, wxFindReplaceData& aSearchData )
+{
+    wxString text = aText;
+    wxString searchText = aSearchData.GetFindString();
+
+    // Don't match if searching for replaceable item and the item doesn't support text replace.
+    if( (aSearchData.GetFlags() & FR_SEARCH_REPLACE) && !IsReplaceable() )
+        return false;
+
+    if( aSearchData.GetFlags() & wxFR_WHOLEWORD )
+        return aText.IsSameAs( searchText, aSearchData.GetFlags() & wxFR_MATCHCASE );
+
+    if( aSearchData.GetFlags() & FR_MATCH_WILDCARD )
+    {
+        if( aSearchData.GetFlags() & wxFR_MATCHCASE )
+            return text.Matches( searchText );
+
+        return text.MakeUpper().Matches( searchText.MakeUpper() );
+    }
+
+    if( aSearchData.GetFlags() & wxFR_MATCHCASE )
+        return aText.Find( searchText ) != wxNOT_FOUND;
+
+    return text.MakeUpper().Find( searchText.MakeUpper() ) != wxNOT_FOUND;
+}
+
+
 bool EDA_ITEM::operator<( const EDA_ITEM& aItem ) const
 {
     wxFAIL_MSG( wxString::Format( wxT( "Less than operator not defined for item type %s." ),