[WindowFrameBackend] Only add parenting when dialog is preparing it be shown

mono / xwt

A cross-platform UI toolkit for creating desktop applications with .NET and Mono

MIT License

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Closed netonjm closed 2 years ago

netonjm commented 2 years ago

This PR fixes some issues in WindowFrameBackend:

NRE whe transientFor is null (we added to cover this scenario)
SetTransientFor tries to set the window passed as a parameter in the funcion and in case is not the current one it sets the value.
Simplifies InternalShow() now takes the parent window and if is Visible and not contains the Window it adds as a children.

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