WTextArea default style improvement
I think in most of the use cases one would avoid to set the number of columns, and would expect instead that the textarea resizes depending on the surroundings etc.
So I would purpose to set on the constructor of WTextArea sthg. like: resize(WLength(99, WLength::Percentage), WLength::Auto) (from the mail example). Eventually remove this setting when user calls setColumns, etc.
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