[Gtk4] Fix layout problems#3331
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On Gtk 4 gtk_widget_hide() resets the widget's allocation to 0x0. If the SWT widget is no longer in the HIDDEN state but visibility hasn't propagated in GTK 4, leave it visible on the GTK side so its allocation (and the propagated allocations of its children) survive. Otherwise children of a Composite that was made visible right before this setBounds call would be left at size 0x0 and miss Resize events. Skip the trailing gtk_widget_hide() on GTK4 when the SWT widget is not in the HIDDEN state, so the allocation survives. GTK3 behaviour is unchanged. Fixes eclipse-platform#3330
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On Gtk 4 gtk_widget_hide() resets the widget's allocation to 0x0. If the SWT widget is no longer in the HIDDEN state but visibility hasn't propagated in GTK 4, leave it visible on the GTK side so its allocation (and the propagated allocations of its children) survive. Otherwise children of a Composite that was made visible right before this setBounds call would be left at size 0x0 and miss Resize events.
Skip the trailing gtk_widget_hide() on GTK4 when the SWT widget is not in the HIDDEN state, so the allocation survives. GTK3 behaviour is unchanged.
Fixes #3330