[Lazarus] ScrollBox and Touchscreen interaction

[Sandro Cumerlato]

Hello,
please take a look at the attached example.

Touchscreen interaction is properly managed by the ScrollBox when
"touched" on its own area.

On the contrary, ScrollBox touchscreen interaction doesn't work if
touched on the background of a contained component.

I consider this different behaviour a bug, because I would scroll the
ScrollBox content touching everywhere.

And if the contained control fulfill the ScrollBox area then the
touchscreen interaction is completely impossible.

Please let me know what you think.

Thank you in advance.

Sandro Cumerlato
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