Allow EDA_RECT to properly be uninitialized

The base initialization of EDA_RECT sets a 0/0/0/0 rectangle that
prevents merging properly with valid EDA_RECT.  This sets the default to
be uninitialized until the internal data are set.

(cherry picked from commit 46feb76aba)

common/base_struct.cpp

@@ -405,6 +405,9 @@ bool EDA_RECT::Intersects( const wxPoint& aPoint1, const wxPoint& aPoint2 ) cons
 
 bool EDA_RECT::Intersects( const EDA_RECT& aRect ) const
 {
+    if( !m_init )
+        return false;
+
     // this logic taken from wxWidgets' geometry.cpp file:
     bool rc;
     EDA_RECT me(*this);
@@ -433,6 +436,9 @@ bool EDA_RECT::Intersects( const EDA_RECT& aRect ) const
 
 bool EDA_RECT::Intersects( const EDA_RECT& aRect, double aRot ) const
 {
+    if( !m_init )
+        return false;
+
     /* Most rectangles will be axis aligned.
      * It is quicker to check for this case and pass the rect
      * to the simpler intersection test
@@ -565,6 +571,9 @@ const wxPoint EDA_RECT::FarthestPointTo( const wxPoint& aPoint ) const
 
 bool EDA_RECT::IntersectsCircle( const wxPoint& aCenter, const int aRadius ) const
 {
+    if( !m_init )
+        return false;
+
     wxPoint closest = ClosestPointTo( aCenter );
 
     double dx = aCenter.x - closest.x;
@@ -578,6 +587,9 @@ bool EDA_RECT::IntersectsCircle( const wxPoint& aCenter, const int aRadius ) con
 
 bool EDA_RECT::IntersectsCircleEdge( const wxPoint& aCenter, const int aRadius, const int aWidth ) const
 {
+    if( !m_init )
+        return false;
+
     EDA_RECT me( *this );
     me.Normalize();         // ensure size is >= 0
 
@@ -675,6 +687,17 @@ EDA_RECT& EDA_RECT::Inflate( wxCoord dx, wxCoord dy )
 
 void EDA_RECT::Merge( const EDA_RECT& aRect )
 {
+    if( !m_init )
+    {
+        if( aRect.IsValid() )
+        {
+            m_Pos = aRect.GetPosition();
+            m_Size = aRect.GetSize();
+            m_init = true;
+        }
+        return;
+    }
+
     Normalize();        // ensure width and height >= 0
     EDA_RECT rect = aRect;
     rect.Normalize();   // ensure width and height >= 0
@@ -692,6 +715,13 @@ void EDA_RECT::Merge( const EDA_RECT& aRect )
 
 void EDA_RECT::Merge( const wxPoint& aPoint )
 {
+    if( !m_init )
+    {
+        m_Pos = aPoint;
+        m_Size = wxSize( 0, 0 );
+        return;
+    }
+
     Normalize();        // ensure width and height >= 0
 
     wxPoint  end = GetEnd();

include/eda_rect.h

@@ -46,13 +46,15 @@ class EDA_RECT
 private:
     wxPoint m_Pos;      // Rectangle Origin
     wxSize  m_Size;     // Rectangle Size
+    bool    m_init;     // Is the rectangle initialized
 
 public:
-    EDA_RECT() { };
+    EDA_RECT() : m_init( false ) { };
 
     EDA_RECT( const wxPoint& aPos, const wxSize& aSize ) :
         m_Pos( aPos ),
-        m_Size( aSize )
+        m_Size( aSize ),
+        m_init( true )
     { }
 
     virtual ~EDA_RECT() { };
@@ -121,20 +123,83 @@ public:
     int GetTop() const { return m_Pos.y; }
     int GetBottom() const { return m_Pos.y + m_Size.y; }    // Y axis from top to bottom
 
-    void SetOrigin( const wxPoint& pos ) { m_Pos = pos; }
+    bool IsValid() const
-    void SetOrigin( int x, int y ) { m_Pos.x = x; m_Pos.y = y; }
-    void SetSize( const wxSize& size ) { m_Size = size; }
-    void SetSize( int w, int h ) { m_Size.x = w; m_Size.y = h; }
-    void Offset( int dx, int dy ) { m_Pos.x += dx; m_Pos.y += dy; }
-    void Offset( const wxPoint& offset ) { m_Pos += offset; }
-    void SetX( int val ) { m_Pos.x = val; }
-    void SetY( int val ) { m_Pos.y = val; }
-    void SetWidth( int val ) { m_Size.x = val; }
-    void SetHeight( int val ) { m_Size.y = val; }
-    void SetEnd( int x, int y ) { SetEnd( wxPoint( x, y ) ); }
-    void SetEnd( const wxPoint& pos )
     {
-        m_Size.x = pos.x - m_Pos.x; m_Size.y = pos.y - m_Pos.y;
+        return m_init;
+    }
+
+    void SetOrigin( const wxPoint &pos )
+    {
+        m_Pos = pos;
+        m_init = true;
+    }
+
+    void SetOrigin( int x, int y )
+    {
+        m_Pos.x = x;
+        m_Pos.y = y;
+        m_init = true;
+    }
+
+    void SetSize( const wxSize &size )
+    {
+        m_Size = size;
+        m_init = true;
+    }
+
+    void SetSize( int w, int h )
+    {
+        m_Size.x = w;
+        m_Size.y = h;
+        m_init = true;
+    }
+
+    void Offset( int dx, int dy )
+    {
+        m_Pos.x += dx;
+        m_Pos.y += dy;
+    }
+
+    void Offset( const wxPoint &offset )
+    {
+        m_Pos += offset;
+    }
+
+    void SetX( int val )
+    {
+        m_Pos.x = val;
+        m_init = true;
+    }
+
+    void SetY( int val )
+    {
+        m_Pos.y = val;
+        m_init = true;
+    }
+
+    void SetWidth( int val )
+    {
+        m_Size.x = val;
+        m_init = true;
+    }
+
+    void SetHeight( int val )
+    {
+        m_Size.y = val;
+        m_init = true;
+    }
+
+    void SetEnd( int x, int y )
+    {
+        SetEnd( wxPoint( x, y ) );
+        m_init = true;
+    }
+
+    void SetEnd( const wxPoint &pos )
+    {
+        m_Size.x = pos.x - m_Pos.x;
+        m_Size.y = pos.y - m_Pos.y;
+        m_init = true;
     }
 
     /**