Unify schematic file version checking with PCBNew.

This also makes sure that the user gets a warning before saving over
an older s-expr format.  While that won't always be wanted, it's now
in the infobar (like in PCBNew), so it's not too onerous.§

Fixes https://gitlab.com/kicad/code/kicad/issues/7347

eeschema/files-io.cpp

@@ -44,6 +44,7 @@
 #include <sch_component.h>
 #include <sch_edit_frame.h>
 #include <sch_plugins/legacy/sch_legacy_plugin.h>
+#include <sch_file_versions.h>
 #include <sch_sheet.h>
 #include <sch_sheet_path.h>
 #include <schematic.h>
@@ -291,6 +292,7 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
     }
 
     SetStatusText( wxEmptyString );
+    m_infoBar->Dismiss();
 
     SCH_IO_MGR::SCH_FILE_T schFileType = SCH_IO_MGR::GuessPluginTypeFromSchPath( fullFileName );
 
@@ -483,24 +485,11 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
             // Update all symbol library links for all sheets.
             schematic.UpdateSymbolLinks();
 
-            if( !cfg || cfg->m_Appearance.show_sexpr_file_convert_warning )
-            {
-                wxRichMessageDialog newFileFormatDlg(
-                        this,
-                        _( "The schematic file will be converted to the new file format on save." ),
-                        _( "Project Load Warning" ),
-                        wxOK | wxCENTER | wxICON_EXCLAMATION );
-                newFileFormatDlg.ShowDetailedText(
-                        _( "This schematic was saved in the legacy file format which is no "
-                           "longer supported and will be saved using the new file format.\n\nThe "
-                           "new file format cannot be opened with previous versions of KiCad." ) );
-                newFileFormatDlg.ShowCheckBox( _( "Do not show this dialog again." ) );
-                newFileFormatDlg.ShowModal();
-
-                if( cfg )
-                    cfg->m_Appearance.show_sexpr_file_convert_warning =
-                            !newFileFormatDlg.IsCheckBoxChecked();
-            }
+            m_infoBar->RemoveAllButtons();
+            m_infoBar->AddCloseButton();
+            m_infoBar->ShowMessage( _( "This file was created by an older version of KiCad. "
+                                       "It will be converted to the new format when saved." ),
+                                    wxICON_WARNING );
 
             // Legacy schematic can have duplicate time stamps so fix that before converting
             // to the s-expression format.
@@ -511,6 +500,15 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
         }
         else  // S-expression schematic.
         {
+            if( schematic.GetFirst()->GetFileFormatVersionAtLoad() < SEXPR_SCHEMATIC_FILE_VERSION )
+            {
+                m_infoBar->RemoveAllButtons();
+                m_infoBar->AddCloseButton();
+                m_infoBar->ShowMessage( _( "This file was created by an older version of KiCad. "
+                                           "It will be converted to the new format when saved." ),
+                                        wxICON_WARNING );
+            }
+
             for( SCH_SCREEN* screen = schematic.GetFirst(); screen; screen = schematic.GetNext() )
                 screen->UpdateLocalLibSymbolLinks();
 
@@ -557,7 +555,6 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
     UpdateTitle();
 
     wxFileName fn = Prj().AbsolutePath( GetScreen()->GetFileName() );
-    m_infoBar->Dismiss();
 
     if( fn.FileExists() && !fn.IsFileWritable() )
     {

eeschema/sch_plugins/kicad/sch_sexpr_parser.cpp

@@ -1981,6 +1981,8 @@ void SCH_SEXPR_PARSER::ParseSchematic( SCH_SHEET* aSheet, bool aIsCopyableOnly,
         parseHeader( T_kicad_sch, SEXPR_SCHEMATIC_FILE_VERSION );
     }
 
+    screen->SetFileFormatVersionAtLoad( m_requiredVersion );
+
     for( token = NextTok();  token != T_RIGHT;  token = NextTok() )
     {
         if( aIsCopyableOnly && token == T_EOF )

eeschema/sch_screen.cpp

@@ -54,9 +54,7 @@
 #include <symbol_lib_table.h>
 #include <tool/common_tools.h>
 
-#include <thread>
 #include <algorithm>
-#include <future>
 
 // TODO(JE) Debugging only
 #include <profile.h>
@@ -64,7 +62,8 @@
 
 SCH_SCREEN::SCH_SCREEN( EDA_ITEM* aParent ) :
     BASE_SCREEN( aParent, SCH_SCREEN_T ),
-    m_paper( wxT( "A4" ) )
+    m_paper( wxT( "A4" ) ),
+    m_fileFormatVersionAtLoad( 0 )
 {
     m_modification_sync = 0;
     m_refCount = 0;

eeschema/sch_screen.h

@@ -94,10 +94,10 @@ class SCH_SCREEN : public BASE_SCREEN
 {
 private:
 
-    wxString    m_fileName;          // File used to load the screen.
-
-    int         m_refCount;          // Number of sheets referencing this screen.
-                                     // Delete when it goes to zero.
+    wxString    m_fileName;                 // File used to load the screen.
+    int         m_fileFormatVersionAtLoad;
+    int         m_refCount;                 // Number of sheets referencing this screen.
+                                            // Delete when it goes to zero.
     /**
      * The list of sheet paths sharing this screen.  Used in some annotation calculations to
      * update alternate references.
@@ -108,16 +108,16 @@ private:
     std::vector<SCH_SHEET_PATH> m_clientSheetPathList;
 
 
-    PAGE_INFO   m_paper;             // The size of the paper to print or plot on
+    PAGE_INFO   m_paper;                    // The size of the paper to print or plot on
     TITLE_BLOCK m_titles;
-    wxPoint     m_aux_origin;        // Origin used for drill & place files by PCBNew
+    wxPoint     m_aux_origin;               // Origin used for drill & place files by PCBNew
     EE_RTREE    m_rtree;
 
-    int         m_modification_sync; // inequality with PART_LIBS::GetModificationHash() will
-                                     //   trigger ResolveAll().
+    int         m_modification_sync;        // inequality with PART_LIBS::GetModificationHash()
+                                            //   will trigger ResolveAll().
 
-    /// Set to true once the zoom value is initialized with `InitZoom()`.
-    bool m_zoomInitialized;
+    bool        m_zoomInitialized;          // Set to true once the zoom value is initialized with
+                                            // `InitZoom()`.
 
     /// List of bus aliases stored in this screen.
     std::unordered_set< std::shared_ptr< BUS_ALIAS > > m_aliases;
@@ -181,6 +181,9 @@ public:
         return wxT( "SCH_SCREEN" );
     }
 
+    void SetFileFormatVersionAtLoad( int aVersion ) { m_fileFormatVersionAtLoad = aVersion; }
+    int GetFileFormatVersionAtLoad()  const { return m_fileFormatVersionAtLoad; }
+
     const PAGE_INFO& GetPageSettings() const                { return m_paper; }
     void SetPageSettings( const PAGE_INFO& aPageSettings )  { m_paper = aPageSettings; }