[STUMP] Bug fix: run-or-raise with float-windows

[Quentin Stievenart]

Hi,

Stumpwm can't run-or-raise windows that are on float-groups because
there's no frame associated with them and run-or-raise try to get the
window's frame.

I joined a patch to fix that, it avoid calling frames related functions
when the window is a float-window.

float-window.diff
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