Fully implement wxStyledTextCtrl::PositionToXY().

Fill in the column parameter too now.

Closes #14332.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71557 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/stc/stc.h

@@ -4200,16 +4200,15 @@ public:
 
     virtual bool PositionToXY(long pos, long *x, long *y) const
     {
+        long l = LineFromPosition(pos);
+        if ( l == -1 )
+            return false;
+
         if ( x )
-            *x = -1; // TODO
+            *x = pos - PositionFromLine(l);
 
         if ( y )
-        {
-            long l = LineFromPosition(pos);
-            if ( l == -1 )
-                return false;
             *y = l;
-        }
 
         return true;
     }