invalidatable: cleanup dead code

Remove invalidatable type and all associated calls. All items can
directly invalidate the UI.

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 0 insertions, 4 deletions

diff --git a/lib/ui/fill.go b/lib/ui/fill.go
index 13ad286d..ff248905 100644
--- a/lib/ui/fill.go
+++ b/lib/ui/fill.go
@@ -21,10 +21,6 @@ func (f Fill) Draw(ctx *Context) {
 	}
 }
 
-func (f Fill) OnInvalidate(callback func(d Drawable)) {
-	// no-op
-}
-
 func (f Fill) Invalidate() {
 	// no-op
 }