Eeschema: fix infinite loop in replace all caused by previous find fix.

* Only check for search cache update on close dialog event instead of every
  update of the find/replace view which caused an infinite loop when replace
  all was called.
* Check for dirty search cache for each find/replace event.
* Add code to save and restore last replace index on cache refresh.

eeschema/find.cpp

@@ -321,6 +321,20 @@ void SCH_EDIT_FRAME::OnFindSchematicItem( wxFindDialogEvent& aEvent )
     {
         if( m_foundItems.GetCount() == 0 )
             return;
+
+        // Refresh the search cache in case something has changed.  This prevents any stale
+        // pointers from crashing Eeschema when the wxEVT_FIND_CLOSE event is handled.
+        if( IsSearchCacheObsolete( searchCriteria ) )
+        {
+            if( aEvent.GetFlags() & FR_CURRENT_SHEET_ONLY && g_RootSheet->CountSheets() > 1 )
+            {
+                m_foundItems.Collect( searchCriteria, m_CurrentSheet );
+            }
+            else
+            {
+                m_foundItems.Collect( searchCriteria );
+            }
+        }
     }
     else if( IsSearchCacheObsolete( searchCriteria ) )
     {
@@ -349,10 +363,32 @@ void SCH_EDIT_FRAME::OnFindSchematicItem( wxFindDialogEvent& aEvent )
 
 void SCH_EDIT_FRAME::OnFindReplace( wxFindDialogEvent& aEvent )
 {
+    static int              nextFoundIndex = 0;
     SCH_ITEM*               item;
     SCH_SHEET_PATH*         sheet;
     SCH_SHEET_LIST          schematic;
     SCH_FIND_COLLECTOR_DATA data;
+    SCH_FIND_REPLACE_DATA   searchCriteria;
+
+    searchCriteria.SetFlags( aEvent.GetFlags() );
+    searchCriteria.SetFindString( aEvent.GetFindString() );
+    searchCriteria.SetReplaceString( aEvent.GetReplaceString() );
+
+    if( IsSearchCacheObsolete( searchCriteria ) )
+    {
+        if( aEvent.GetFlags() & FR_CURRENT_SHEET_ONLY && g_RootSheet->CountSheets() > 1 )
+        {
+            m_foundItems.Collect( searchCriteria, m_CurrentSheet );
+        }
+        else
+        {
+            m_foundItems.Collect( searchCriteria );
+        }
+
+        // Restore the next found index on cache refresh.  Prevents single replace events
+        // from starting back at the beginning of the cache.
+        m_foundItems.SetFoundIndex( nextFoundIndex );
+    }
 
     if( aEvent.GetEventType() == wxEVT_COMMAND_FIND_REPLACE_ALL )
     {
@@ -385,7 +421,7 @@ void SCH_EDIT_FRAME::OnFindReplace( wxFindDialogEvent& aEvent )
     }
     else
     {
-        SCH_ITEM* item = (SCH_ITEM*) m_foundItems.GetItem( data );
+        item = (SCH_ITEM*) m_foundItems.GetItem( data );
 
         wxCHECK_RET( item != NULL, wxT( "Invalid replace item in find collector list." ) );
 
@@ -408,6 +444,7 @@ void SCH_EDIT_FRAME::OnFindReplace( wxFindDialogEvent& aEvent )
         }
 
         m_foundItems.IncrementIndex();
+        nextFoundIndex = m_foundItems.GetFoundIndex();
     }
 
     // End the replace if we are at the end if the list.  This prevents an infinite loop if
@@ -430,20 +467,6 @@ void SCH_EDIT_FRAME::updateFindReplaceView( wxFindDialogEvent& aEvent )
     searchCriteria.SetFindString( aEvent.GetFindString() );
     searchCriteria.SetReplaceString( aEvent.GetReplaceString() );
 
-    // Refresh the search cache in case something has changed.  This prevents any stale
-    // pointers.
-    if( IsSearchCacheObsolete( searchCriteria ) )
-    {
-        if( aEvent.GetFlags() & FR_CURRENT_SHEET_ONLY && g_RootSheet->CountSheets() > 1 )
-        {
-            m_foundItems.Collect( searchCriteria, m_CurrentSheet );
-        }
-        else
-        {
-            m_foundItems.Collect( searchCriteria );
-        }
-    }
-
     if( m_foundItems.GetItem( data ) != NULL )
     {
         wxLogTrace( traceFindReplace, wxT( "Found " ) + m_foundItems.GetText() );

eeschema/sch_collectors.h

@@ -272,8 +272,14 @@ public:
 
     void SetForceSearch( bool doSearch = true ) { m_forceSearch = doSearch; }
 
-    int GetLibHash() const          { return m_lib_hash; }
-    void SetLibHash( int aHash )    { m_lib_hash = aHash; }
+    int GetLibHash() const           { return m_lib_hash; }
+    void SetLibHash( int aHash )     { m_lib_hash = aHash; }
+
+    int GetFoundIndex() const        { return m_foundIndex; }
+    void SetFoundIndex( int aIndex )
+    {
+        m_foundIndex = ( (unsigned) aIndex < m_data.size() ) ? aIndex : 0;
+    }
 
     /**
      * Function PassedEnd