compatibility with wxWdigets 2.9+: Vector2D use *0.5 instead of /2 to prevent...

compatibility with wxWdigets 2.9+: Vector2D use *0.5 instead of /2 to prevent ambiguous conversion errors

src/gui/symbol/basic_shape_editor.cpp

@@ -180,7 +180,7 @@ void SymbolBasicShapeEditor::makeShape(Vector2D a, Vector2D b, bool constrained,
 	if (centered) {
 		makeCenteredShape(a, size, constrained);
 	} else {
-		makeCenteredShape(a + size / 2, size / 2, constrained);
+		makeCenteredShape(a + size * 0.5, size * 0.5, constrained);
 	}
 }