Show project path using native OS format

Avoids showing project paths as d:/... on windows, and instead
uses the more familiar d:\... format

(cherry-picked from 71347c)

Author: nyalldawson

src/app/qgisapp.cpp

@@ -3251,7 +3251,7 @@ void QgisApp::updateRecentProjectPaths()
 
   Q_FOREACH ( const QgsWelcomePageItemsModel::RecentProjectData& recentProject, mRecentProjects )
   {
-    QAction* action = mRecentProjectsMenu->addAction( QString( "%1 (%2)" ).arg( recentProject.title != recentProject.path ? recentProject.title : QFileInfo( recentProject.path ).baseName(), recentProject.path ) );
+    QAction* action = mRecentProjectsMenu->addAction( QString( "%1 (%2)" ).arg( recentProject.title != recentProject.path ? recentProject.title : QFileInfo( recentProject.path ).baseName(), QDir::toNativeSeparators( recentProject.path ) ) );
     action->setEnabled( QFile::exists(( recentProject.path ) ) );
     action->setData( recentProject.path );
   }
@@ -5041,7 +5041,7 @@ bool QgisApp::fileSave()
   if ( QgsProject::instance()->write() )
   {
     setTitleBarText_( *this ); // update title bar
-    statusBar()->showMessage( tr( "Saved project to: %1" ).arg( QgsProject::instance()->fileName() ), 5000 );
+    statusBar()->showMessage( tr( "Saved project to: %1" ).arg( QDir::toNativeSeparators( QgsProject::instance()->fileName() ) ), 5000 );
 
     saveRecentProjectPath( fullPath.filePath() );
 
@@ -5051,7 +5051,7 @@ bool QgisApp::fileSave()
   else
   {
     QMessageBox::critical( this,
-                           tr( "Unable to save project %1" ).arg( QgsProject::instance()->fileName() ),
+                           tr( "Unable to save project %1" ).arg( QDir::toNativeSeparators( QgsProject::instance()->fileName() ) ),
                            QgsProject::instance()->error() );
     return false;
   }
@@ -5093,15 +5093,15 @@ void QgisApp::fileSaveAs()
   if ( QgsProject::instance()->write() )
   {
     setTitleBarText_( *this ); // update title bar
-    statusBar()->showMessage( tr( "Saved project to: %1" ).arg( QgsProject::instance()->fileName() ), 5000 );
+    statusBar()->showMessage( tr( "Saved project to: %1" ).arg( QDir::toNativeSeparators( QgsProject::instance()->fileName() ) ), 5000 );
     // add this to the list of recently used project files
     saveRecentProjectPath( fullPath.filePath() );
     mProjectLastModified = fullPath.lastModified();
   }
   else
   {
     QMessageBox::critical( this,
-                           tr( "Unable to save project %1" ).arg( QgsProject::instance()->fileName() ),
+                           tr( "Unable to save project %1" ).arg( QDir::toNativeSeparators( QgsProject::instance()->fileName() ) ),
                            QgsProject::instance()->error(),
                            QMessageBox::Ok,
                            Qt::NoButton );

src/app/qgsprojectproperties.cpp

@@ -154,7 +154,7 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas* mapCanvas, QWidget *pa
 
   mAutoTransaction->setChecked( QgsProject::instance()->autoTransaction() );
   title( QgsProject::instance()->title() );
-  mProjectFileLineEdit->setText( QgsProject::instance()->fileName() );
+  mProjectFileLineEdit->setText( QDir::toNativeSeparators( QgsProject::instance()->fileName() ) );
 
   // get the manner in which the number of decimal places in the mouse
   // position display is set (manual or automatic)

src/app/qgswelcomepageitemsmodel.cpp

@@ -25,6 +25,7 @@
 #include <QFileInfo>
 #include <QPainter>
 #include <QTextDocument>
+#include <QDir>
 
 QgsWelcomePageItemDelegate::QgsWelcomePageItemDelegate( QObject * parent )
     : QStyledItemDelegate( parent )
@@ -146,7 +147,7 @@ QVariant QgsWelcomePageItemsModel::data( const QModelIndex& index, int role ) co
     case TitleRole:
       return mRecentProjects.at( index.row() ).title != mRecentProjects.at( index.row() ).path ? mRecentProjects.at( index.row() ).title : QFileInfo( mRecentProjects.at( index.row() ).path ).baseName();
     case PathRole:
-      return mRecentProjects.at( index.row() ).path;
+      return QDir::toNativeSeparators( mRecentProjects.at( index.row() ).path );
     case CrsRole:
       if ( mRecentProjects.at( index.row() ).crs != "" )
       {