[Lazarus] Hiding a component by changing its parent

[Martin Grajcar]

In code I'm working on, I've found a pattern like

PROCEDURE HideIt;
BEGIN
  SomeComponent.Visible := FALSE;
  SomeComponent.Parent := SELF;
  SomeComponent.Visible := TRUE;
END;

PROCEDURE ShowIt(NewParent: TForm);
BEGIN
  SomeComponent.Visible := FALSE;
  SomeComponent.Parent := NewParent;
  ...some more stuff...
  SomeComponent.Visible := TRUE;
  ...some more stuff...
END;

I can't really see what it's good for. I guess, the idea was to preserve
the widget, but the widget seems to get freed immediately in the first
line. It comes from D7 or older. Does it make sense on Lazarus 1.4 using
GTK+?

Whenever there's a focused TextField in SomeComponent, there's a segment
violation on Linux after HideIt. It looks like an event (lost focus?) gets
delivered to its already freed widget. Any thoughts?
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