Remove write-only field UI_GADGET::oldstatus

common/include/ui.h

@@ -80,7 +80,6 @@ struct UI_GADGET
 	struct UI_GADGET  * when_right;  \
 	struct UI_GADGET  * parent;    \
 	int             status;     \
-	int             oldstatus;  \
 	grs_subcanvas_ptr canvas;     \
 protected:
 	~UI_GADGET() = default;

common/ui/gadget.cpp

@@ -85,7 +85,6 @@ void ui_gadget_add(UI_DIALOG &dlg, short x1, short y1, short x2, short y2, UI_GA
 	gadget.when_left = nullptr;
 	gadget.when_right = nullptr;
 	gadget.status = 1;
-	gadget.oldstatus = 0;
 	if (x1 == 0 && x2 == 0 && y1 == 0 && y2 == 0)
 		gadget.canvas.reset();
 	else