Fix issues in auto-save files:

* auto-save was broken for all sub sheets with are in a sub-directory of the project directory. (reason wxFileName::Normalize(), used to create the absolute path  has issues with filenames starting by '$', perhaps due to env var which also start by $). the auto-save prefix is modified ( now AUTOSAVE_PREFIX_FILENAME which defines "_save_"  ) and defined only once.
* auto-save files from sub-sheets were not found due to the fact the path was not set (fixed by Blair Bonnet's patch)

common/basicframe.cpp

@@ -692,7 +692,7 @@ void EDA_BASE_FRAME::CheckForAutoSaveFile( const wxFileName& aFileName,
     wxFileName autoSaveFileName = aFileName;
 
     // Check for auto save file.
-    autoSaveFileName.SetName( wxT( "$" ) + aFileName.GetName() );
+    autoSaveFileName.SetName( AUTOSAVE_PREFIX_FILENAME + aFileName.GetName() );
 
     wxLogTrace( traceAutoSave,
                 wxT( "Checking for auto save file " ) + autoSaveFileName.GetFullPath() );
@@ -701,9 +701,10 @@ void EDA_BASE_FRAME::CheckForAutoSaveFile( const wxFileName& aFileName,
         return;
 
     wxString msg = wxString::Format( _(
-            "Well this is potentially embarrassing!  It appears that the last time "
+            "Well this is potentially embarrassing!\n"
-            "you were editing the file '%s' it was not saved properly.  Do you wish to restore the last "
+            "It appears that the last time you were editing the file\n"
-            "edits you made?" ),
+            "'%s'\n"
+            "it was not saved properly.  Do you wish to restore the last saved edits you made?" ),
             GetChars( aFileName.GetFullName() )
         );
 

common/project.cpp

@@ -357,7 +357,6 @@ const wxString PROJECT::AbsolutePath( const wxString& aFileName ) const
     if( !fn.IsAbsolute() )
     {
         wxString pro_dir = wxPathOnly( GetProjectFullName() );
-
         fn.Normalize( wxPATH_NORM_ALL, pro_dir );
     }
 

eeschema/files-io.cpp

@@ -121,7 +121,7 @@ bool SCH_EDIT_FRAME::SaveEEFile( SCH_SCREEN* aScreen, bool aSaveUnderNewName, bo
     {
         // Delete auto save file.
         wxFileName autoSaveFileName = schematicFileName;
-        autoSaveFileName.SetName( wxT( "$" ) + schematicFileName.GetName() );
+        autoSaveFileName.SetName( AUTOSAVE_PREFIX_FILENAME + schematicFileName.GetName() );
 
         if( autoSaveFileName.FileExists() )
         {
@@ -520,8 +520,8 @@ bool SCH_EDIT_FRAME::doAutoSave()
 
         tmpFileName = fn = screen->GetFileName();
 
-        // Auto save file name is the normal file name prefixed with $.
+        // Auto save file name is the normal file name prefixed with AUTOSAVE_PREFIX_FILENAME.
-        fn.SetName( wxT( "$" ) + fn.GetName() );
+        fn.SetName( AUTOSAVE_PREFIX_FILENAME + fn.GetName() );
 
         screen->SetFileName( fn.GetFullPath() );
 

eeschema/load_one_schematic_file.cpp

@@ -66,15 +66,7 @@ bool SCH_EDIT_FRAME::LoadOneEEFile( SCH_SCREEN* aScreen, const wxString& aFullFi
     if( aFullFileName.IsEmpty() )
         return false;
 
-    fn = aFullFileName;
+    // If path is relative, this expands it from the project directory.
-    CheckForAutoSaveFile( fn, SchematicBackupFileExtension );
-
-    wxLogTrace( traceAutoSave, wxT( "Loading schematic file " ) + aFullFileName );
-
-    aScreen->SetCurItem( NULL );
-    if( !append )
-        aScreen->SetFileName( aFullFileName );
-
     wxString fname = Prj().AbsolutePath( aFullFileName );
 
 #ifdef __WINDOWS__
@@ -83,6 +75,15 @@ bool SCH_EDIT_FRAME::LoadOneEEFile( SCH_SCREEN* aScreen, const wxString& aFullFi
     fname.Replace( wxT("\\"), wxT("/") );
 #endif
 
+    fn = fname;
+    CheckForAutoSaveFile( fn, SchematicBackupFileExtension );
+
+    wxLogTrace( traceAutoSave, wxT( "Loading schematic file " ) + aFullFileName );
+
+    aScreen->SetCurItem( NULL );
+    if( !append )
+        aScreen->SetFileName( aFullFileName );
+
     FILE* f = wxFopen( fname, wxT( "rt" ) );
 
     if( !f )

eeschema/schframe.cpp

@@ -634,8 +634,8 @@ void SCH_EDIT_FRAME::OnCloseWindow( wxCloseEvent& aEvent )
     {
         fn = Prj().AbsolutePath( screen->GetFileName() );
 
-        // Auto save file name is the normal file name prepended with $.
+        // Auto save file name is the normal file name prepended with AUTOSAVE_PREFIX_FILENAME.
-        fn.SetName( wxT( "$" ) + fn.GetName() );
+        fn.SetName( AUTOSAVE_PREFIX_FILENAME + fn.GetName() );
 
         if( fn.FileExists() && fn.IsFileWritable() )
             wxRemoveFile( fn.GetFullPath() );

include/wxstruct.h

@@ -60,6 +60,16 @@
 #define CREATE_BACKUP_FILE    true
 #define NO_BACKUP_FILE        false
 
+/**
+ * a prefix to create filenames for schematic files or other difile when auto-saved
+ * to retrieve a crash
+ * The auto-saved filenames are AUTOSAVE_PREFIX_FILENAME + <sourcefilename>
+ * where <sourcefilename> is the flename without path of the auto-saved file
+ * Warning: avoid any special char like / \ $ % which can create issues on Unix
+ * or Window with filenames or env var expansion.
+ */
+#define AUTOSAVE_PREFIX_FILENAME wxT( "_saved_" )
+
 
 class EDA_ITEM;
 class EDA_RECT;