[Lazarus] Patch: single button on taskbar

[Silvio Clecio]

Zaher Dirkey escreveu:
[...]
> @Silvio i decided it belong your patch, becuase i noticed you are use
> "UpdateShowInTaskBar" in some function, if we follow it to Win32
[...]

Hellow Zaher :)

I tested only on Linux(Ubuntu) :/

Gave an error when compiling, but I created .lfm (msgview.lfm) and
compiled normal.

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Silvio Clécio
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