[Lazarus] BidiMode improvments patch

[Paul Ishenin]

Zaher Dirkey wrote:
> Hi, thanks for the replay
> @Paul
> If it is just TMenu i have no problem, but there are a another
> components (TTrayIcon, ...), and some components i have plan to create
> it in my job.
>   
It is not a problem to create this code for TMenu, TTrayIcon and 
TApplication. As I remember all others are TControl descendant.
> @Hans
> The trigger will be done by dispatch message CM_PARENTBIDIMODECHANGED,
> but i am who prefer to call virtual methods instead of perform
> messages to components.
>   
We can prefere anything but some third-party controls can depend on this 
message. Therefore I see no reason to reimplement it using virtual methods.

Best regards,
Paul Ishenin.