added a way to force a relayout

src/ugui_impl.c3

@@ -42,7 +42,6 @@ fn void! Ctx.init(&ctx)
 {
 	ctx.tree.init(MAX_ELEMENTS)!;
 	defer catch { (void)ctx.tree.free(); }
-	//ug_fifo_init(&ctx.fifo, MAX_CMDS);
 
 	ctx.cache.init()!;
 	defer catch { (void)ctx.cache.free(); }
@@ -72,7 +71,8 @@ fn void! Ctx.frame_begin(&ctx)
 	// The root should have the updated flag only if the size of the window
 	// was changed between frames, this propagates an element size recalculation
 	// down the element tree
-	c_elem.flags.updated = ctx.input.events.resize;
+	c_elem.flags.updated = ctx.input.events.resize | ctx.input.events.force_update;
+	ctx.input.events.force_update = false;
 	// if the window has focus then the root element also has focus, no other
 	// computation needed, child elements need to check the mouse positon and
 	// other stuff
@@ -106,13 +106,20 @@ fn void! Ctx.frame_begin(&ctx)
 	// TODO: add a background color taken from a theme or config
 }
 
+fn void! Ctx.force_update(&ctx)
+{
+	ctx.input.events.force_update = true;
+}
+
 fn void! Ctx.frame_end(&ctx)
 {
 	// 1. clear the tree
 	ctx.tree.prune(0)!;
 
 	// 2. clear input fields
+	bool f = ctx.input.events.force_update;
 	ctx.input.events = (InputEvents)0;
+	ctx.input.events.force_update = f;
 
 	// draw mouse position
 $if 1:
@@ -130,9 +137,9 @@ $if 1:
 $endif
 }
 
-/**
+<*
  * @ensure elem != null
-**/
+ *>
 fn bool Ctx.is_hovered(&ctx, Elem *elem)
 {
 	return point_in_rect(ctx.input.mouse.pos, elem.bounds);

src/ugui_input.c3

@@ -8,6 +8,7 @@ bitstruct InputEvents : uint {
 	bool change_focus : 1; // window focus changed
 	bool mouse_move : 2; // mouse was moved
 	bool mouse_btn : 3; // mouse button pressed or released
+	bool force_update : 4;
 }
 
 // Window size was changed