eeschema page numbers: match print and plotting ordering to page number ordering

- new function SCH_SHEET_LIST::SortByPageNumbers() which uses SCH_SHEET::ComparePageNum for the sorting algorithm
- SortByPageNumbers() is called after every call to BuildSheetList()

eeschema/plotters/plot_schematic_DXF.cpp

@@ -54,9 +54,14 @@ void DIALOG_PLOT_SCHEMATIC::CreateDXFFile( bool aPlotAll, bool aPlotFrameRef,
     SCH_SHEET_LIST sheetList;
 
     if( aPlotAll )
+    {
         sheetList.BuildSheetList( &schframe->Schematic().Root(), true );
+        sheetList.SortByPageNumbers();
+    }
     else
+    {
         sheetList.push_back( schframe->GetCurrentSheet() );
+    }
 
     REPORTER& reporter = m_MessagesBox->Reporter();
 

eeschema/plotters/plot_schematic_HPGL.cpp

@@ -102,9 +102,14 @@ void DIALOG_PLOT_SCHEMATIC::createHPGLFile( bool aPlotAll, bool aPlotFrameRef,
     SCH_SHEET_LIST  sheetList;
 
     if( aPlotAll )
+    {
         sheetList.BuildSheetList( &m_parent->Schematic().Root(), true );
+        sheetList.SortByPageNumbers();
+    }
     else
+    {
         sheetList.push_back( m_parent->GetCurrentSheet() );
+    }
 
     REPORTER& reporter = m_MessagesBox->Reporter();
 

eeschema/plotters/plot_schematic_PDF.cpp

@@ -57,9 +57,14 @@ void DIALOG_PLOT_SCHEMATIC::createPDFFile( bool aPlotAll, bool aPlotFrameRef,
     SCH_SHEET_LIST sheetList;
 
     if( aPlotAll )
+    {
         sheetList.BuildSheetList( &m_parent->Schematic().Root(), true );
+        sheetList.SortByPageNumbers();
+    }
     else
+    {
         sheetList.push_back( m_parent->GetCurrentSheet() );
+    }
 
     // Allocate the plotter and set the job level parameter
     PDF_PLOTTER* plotter = new PDF_PLOTTER();

eeschema/plotters/plot_schematic_PS.cpp

@@ -54,9 +54,14 @@ void DIALOG_PLOT_SCHEMATIC::createPSFile( bool aPlotAll, bool aPlotFrameRef,
     SCH_SHEET_LIST  sheetList;
 
     if( aPlotAll )
+    {
         sheetList.BuildSheetList( &m_parent->Schematic().Root(), true );
+        sheetList.SortByPageNumbers();
+    }
     else
+    {
         sheetList.push_back( m_parent->GetCurrentSheet() );
+    }
 
     for( unsigned i = 0; i < sheetList.size(); i++ )
     {

eeschema/plotters/plot_schematic_SVG.cpp

@@ -53,9 +53,14 @@ void DIALOG_PLOT_SCHEMATIC::createSVGFile( bool aPrintAll, bool aPrintFrameRef,
     SCH_SHEET_LIST  sheetList;
 
     if( aPrintAll )
+    {
         sheetList.BuildSheetList( &m_parent->Schematic().Root(), true );
+        sheetList.SortByPageNumbers();
+    }
     else
+    {
         sheetList.push_back( m_parent->GetCurrentSheet() );
+    }
 
     for( unsigned i = 0; i < sheetList.size(); i++ )
     {

eeschema/sch_sheet_path.cpp

@@ -426,7 +426,10 @@ void SCH_SHEET_PATH::SetPageNumber( const wxString& aPageNumber )
 SCH_SHEET_LIST::SCH_SHEET_LIST( SCH_SHEET* aSheet, bool aCheckIntegrity )
 {
     if( aSheet != NULL )
+    {
         BuildSheetList( aSheet, aCheckIntegrity );
+        SortByPageNumbers();
+    }
 }
 
 
@@ -477,6 +480,29 @@ void SCH_SHEET_LIST::BuildSheetList( SCH_SHEET* aSheet, bool aCheckIntegrity )
 }
 
 
+void SCH_SHEET_LIST::SortByPageNumbers( bool aUpdateVirtualPageNums )
+{
+    std::sort( begin(), end(), 
+        []( SCH_SHEET_PATH a, SCH_SHEET_PATH b ) -> bool 
+        {
+            wxString pageA = a.GetPageNumber();
+            wxString pageB = b.GetPageNumber();
+
+            return SCH_SHEET::ComparePageNum( pageA, pageB ) < 0;
+        } );
+
+    if( aUpdateVirtualPageNums )
+    {
+        int virtualPageNum = 1;
+
+        for( SCH_SHEET_PATH& sheet : *this )
+        {
+            sheet.SetVirtualPageNumber( virtualPageNum++ );
+        }
+    }
+}
+
+
 bool SCH_SHEET_LIST::NameExists( const wxString& aSheetName )
 {
     for( const SCH_SHEET_PATH& sheet : *this )

eeschema/sch_sheet_path.h

@@ -437,12 +437,25 @@ public:
      *
      * If \a aSheet is the root sheet, the full sheet path and sheet list are built.
      * 
+     * The list will be ordered as per #SCH_SCREEN::GetSheets which results in sheets being ordered
+     * in the legacy way of using the X and Y positions of the sheets.
+     * 
+     * @see #SortByPageNumbers to sort by page numbers
+     *
      * @param aSheet is the starting sheet from which the list is built, or NULL
      *               indicating that g_RootSheet should be used.
      * @throw std::bad_alloc if the memory for the sheet path list could not be allocated.
      */
     void BuildSheetList( SCH_SHEET* aSheet, bool aCheckIntegrity );
     
+    /**
+     * Sorts the list of sheets by page number. This should be called after #BuildSheetList
+     * 
+     * @param aUpdateVirtualPageNums If true, updates the virtual page numbers to match the new
+     * ordering
+     */
+    void SortByPageNumbers( bool aUpdateVirtualPageNums = true );
+
     bool NameExists( const wxString& aSheetName );
 
     /**

eeschema/schematic.cpp

@@ -357,6 +357,7 @@ SCH_SHEET_LIST& SCHEMATIC::GetFullHierarchy() const
 
     hierarchy.clear();
     hierarchy.BuildSheetList( m_rootSheet, false );
+    hierarchy.SortByPageNumbers();
 
     return hierarchy;
 }