eeschema: bug soved (see changelog). Doc update

change_log.txt

@@ -5,6 +5,12 @@ Started 2007-June-11
 Please add newer entries at the top, list the date and your name with
 email address.
 
+2008-June-15 UPDATE   Jean-Pierre Charras <jean-pierre.charras@inpg.fr>
+================================================================================
++eeschema:
+    Bug solved: Eeschema crashed when creating a new subsheet with the same
+    filename as an existing filename, if loading this existing file.
+
 
 2008-June-11 UPDATE   Jean-Pierre Charras <jean-pierre.charras@inpg.fr>
 ================================================================================
@@ -15,10 +21,10 @@ email address.
     - Only one file for application
     - Is standart (The old html format used a zipped archive, not standart)
     - the doc tree is less complex (see doc/help/fr or doc/help/en for the new tree).
-    
+
     If a localized doc file is not found, the english version is automatically loaded instead.
     No need to copy the same pdf file in subdirectory.
-    
+
 
 2008-June-06 UPDATE   Jean-Pierre Charras <jean-pierre.charras@inpg.fr>
 ================================================================================

eeschema/class_drawsheet.cpp

@@ -574,10 +574,13 @@ bool DrawSheetStruct::ChangeFileName( WinEDA_SchematicFrame* aFrame, const wxStr
         if( IsOK( NULL, msg ) )
         {
             LoadFromFile = true;
-            m_AssociatedScreen->m_RefCount--;                                       //be careful with these
-            if( m_AssociatedScreen->m_RefCount == 0 )
-                SAFE_DELETE( m_AssociatedScreen );
-            m_AssociatedScreen = NULL;         //will be created later
+            if ( m_AssociatedScreen )   // Can be NULL if loading a file when creating a new sheet
+            {
+                m_AssociatedScreen->m_RefCount--;                 //be careful with these
+                if( m_AssociatedScreen->m_RefCount == 0 )
+                    SAFE_DELETE( m_AssociatedScreen );
+                m_AssociatedScreen = NULL;         //will be created later
+            }
         }
     }