Show/HideWayland window

[yan.wang at linux.intel.com]

I may destroy (Hide) and re-construct surafce (show) to achieve this
point. But I think we may have 2 reasons to implement show/hide:
1. It may reduce unnecessary cost when switch frequently.
2. re-construct surface may have to restore some user data. If wayland
could do this, it could avoid application to save additional data.

Yan Wang

> There was a bit of discussion about this because I thought it was
> necessary, too. However it appears that there is no actual reason to
> differentiate hide from the destruction of the surface (you then show by
> making a new surface and attaching the image buffer to that).
>
> yan.wang at linux.intel.com wrote:
>> Hi, All,
>>     Current Wayland seems not support to show/hide existed Wayland
>> Window.
>> May it be implemented in the future? Many applications need this
>> feature. (E.g. chromium browser)
>>     Thanks.
>>
>> Best regards
>> Yan Wang
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