Loïc Blot 1b3e4e1736 Formspec: Add options to set background color and opacity (fullscreen mode + default mode) (#5493) ...

* Formspec: Add options to set background color and opacity (fullscreen mode)

* Enhance previous comment: Set formspec background when regenerate UI.

* This permit to do the calcul only at regen and override it with bgcolor tag
* Add a setting for default background color into formspec, separated from fullscreen
* Add a little performance gain on formspecs using a const ref instead of copying formspec string

2017-08-29 19:25:16 +02:00

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