Why when I call window.set_visible(true); a second time is shown a blank
window to me ?
I add some widgets to a Box and then add the box to the window:
hscales.show_all();
scale_window.add(hscales);
now in a callback I call set_visible:
scale_window.set_visible(true);
In the first time after run application the windows is shown correct,
but after hide ( set_visible(false) ) and set_visible(true) again I get
a blank window, why ?
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