Fix selection clearance for via and tracks

- fixed via bounding box calculation in TRACK::GetBoundingBox()
- moved clearance to TRACK::ViewBBox()
- modified the Selection Tool to use EDA_ITEM::GetBoundingBox() rather
than VIEW_ITEM::ViewBBox() to determine selection

Fixes: lp:1776314
* https://bugs.launchpad.net/kicad/+bug/1776314

pcbnew/class_track.cpp

@@ -290,23 +290,11 @@ STATUS_FLAGS TRACK::IsPointOnEnds( const wxPoint& point, int min_dist )
 const EDA_RECT TRACK::GetBoundingBox() const
 {
     // end of track is round, this is its radius, rounded up
-    int radius;
-
-    int ymax;
-    int xmax;
-
-    int ymin;
-    int xmin;
+    int radius = ( m_Width + 1 ) / 2;
+    int ymax, xmax, ymin, xmin;
 
     if( Type() == PCB_VIA_T )
     {
-        // Because vias are sometimes drawn larger than their m_Width would
-        // provide, erasing them using a dirty rect must also compensate for this
-        // possibility (that the via is larger on screen than its m_Width would provide).
-        // Because it is cheap to return a larger BoundingBox, do it so that
-        // the via gets erased properly.  Do not divide width by 2 for this reason.
-        radius = m_Width;
-
         ymax = m_Start.y;
         xmax = m_Start.x;
 
@@ -315,8 +303,6 @@ const EDA_RECT TRACK::GetBoundingBox() const
     }
     else
     {
-        radius = ( m_Width + 1 ) / 2;
-
         ymax = std::max( m_Start.y, m_End.y );
         xmax = std::max( m_Start.x, m_End.x );
 
@@ -324,9 +310,6 @@ const EDA_RECT TRACK::GetBoundingBox() const
         xmin = std::min( m_Start.x, m_End.x );
     }
 
-    // + 1 is for the clearance line itself.
-    radius += GetClearance() + 1;
-
     ymax += radius;
     xmax += radius;
 
@@ -822,6 +805,14 @@ unsigned int TRACK::ViewGetLOD( int aLayer, KIGFX::VIEW* aView ) const
 }
 
 
+const BOX2I TRACK::ViewBBox() const
+{
+    BOX2I bbox( GetBoundingBox() );
+    bbox.Inflate( 2 * GetClearance() );
+    return bbox;
+}
+
+
 void VIA::Draw( EDA_DRAW_PANEL* panel, wxDC* aDC, GR_DRAWMODE aDrawMode, const wxPoint& aOffset )
 {
     wxCHECK_RET( panel != NULL, wxT( "VIA::Draw panel cannot be NULL." ) );

pcbnew/class_track.h

@@ -304,6 +304,8 @@ public:
 
     virtual unsigned int ViewGetLOD( int aLayer, KIGFX::VIEW* aView ) const override;
 
+    const BOX2I ViewBBox() const override;
+
     virtual void SwapData( BOARD_ITEM* aImage ) override;
 
 #if defined (DEBUG)

pcbnew/tools/selection_tool.cpp

@@ -624,7 +624,9 @@ bool SELECTION_TOOL::selectMultiple()
 
                 if( windowSelection )
                 {
-                    if( selectionBox.Contains( item->ViewBBox() ) )
+                    BOX2I bbox( item->GetBoundingBox() );
+
+                    if( selectionBox.Contains( bbox ) )
                     {
                         if( m_subtractive )
                             unselect( item );