Properly fix accordion issue

The true issue was that we were focusing the line in the view before it gets resized in the layout function.
This meant if the view was squashed in accordion mode, the view wouldn't know how to set the cursor/origin to
focus the line.

Now we've got a queue of 'after layout' functions i.e. functions to call at the end of the layout function,
right before views are drawn.

The only caveat is that we can't have an infinite buffer so we're arbitrarily capping it at 1000 and dropping
functions if we exceed that limit. But that really should never happen.

pkg/gui/context/list_context_trait.go

@@ -31,7 +31,14 @@ func (self *ListContextTrait) GetList() types.IList {
 }
 
 func (self *ListContextTrait) FocusLine() {
-	self.GetViewTrait().FocusPoint(self.list.GetSelectedLineIdx())
+	// Doing this at the end of the layout function because we need the view to be
+	// resized before we focus the line, otherwise if we're in accordion mode
+	// the view could be squashed and won't how to adjust the cursor/origin
+	self.c.AfterLayout(func() error {
+		self.GetViewTrait().FocusPoint(self.list.GetSelectedLineIdx())
+		return nil
+	})
+
 	self.setFooter()
 
 	if self.refreshViewportOnChange {