Remove schematic view size limitation

We don't need to worry about scrollbar button sizes anymore, so we don't
need to limit the viewport size based on the page

Fixes https://gitlab.com/kicad/code/kicad/-/issues/20594

eeschema/sch_view.cpp

@@ -49,13 +49,6 @@ SCH_VIEW::SCH_VIEW( SCH_BASE_FRAME* aFrame ) :
     VIEW()
 {
     m_frame = aFrame;
-
-    // Set m_boundary to define the max working area size. The default value is acceptable for
-    // Pcbnew and Gerbview, but too large for Eeschema due to very different internal units.
-    // A full size = 3 * MAX_PAGE_SIZE_MILS size allows a wide margin around the drawing-sheet.
-    double max_size = schIUScale.MilsToIU( MAX_PAGE_SIZE_EESCHEMA_MILS ) * 3.0;
-    m_boundary.SetOrigin( -max_size/4, -max_size/4 );
-    m_boundary.SetSize( max_size, max_size );
 }
 
 
@@ -82,16 +75,6 @@ void SCH_VIEW::SetScale( double aScale, VECTOR2D aAnchor )
 }
 
 
-void SCH_VIEW::ResizeSheetWorkingArea( const SCH_SCREEN* aScreen )
-{
-    const PAGE_INFO& page_info = aScreen->GetPageSettings();
-    double           max_size_x = page_info.GetWidthIU( schIUScale.IU_PER_MILS ) * 3.0;
-    double           max_size_y = page_info.GetHeightIU( schIUScale.IU_PER_MILS ) * 3.0;
-    m_boundary.SetOrigin( -max_size_x / 4, -max_size_y / 4 );
-    m_boundary.SetSize( max_size_x, max_size_y );
-}
-
-
 void SCH_VIEW::DisplaySheet( const SCH_SCREEN *aScreen )
 {
     for( SCH_ITEM* item : aScreen->Items() )
@@ -123,8 +106,6 @@ void SCH_VIEW::DisplaySheet( const SCH_SCREEN *aScreen )
         m_drawingSheet->SetSheetPath( "" );
     }
 
-    ResizeSheetWorkingArea( aScreen );
-
     Add( m_drawingSheet.get() );
 
     InitPreview();

eeschema/sch_view.h

@@ -105,9 +105,6 @@ public:
     void DisplaySheet( const SCH_SCREEN* aScreen );
     void DisplaySymbol( LIB_SYMBOL* aSymbol );
 
-    // Call it to set new draw area limits (max working and draw area size)
-    void ResizeSheetWorkingArea( const SCH_SCREEN *aScreen );
-
     void SetScale( double aScale, VECTOR2D aAnchor = { 0, 0 } ) override;
 
     /**