Add Window::is_minimized

Co-authored-by: Kirill Chibisov <contact@kchibisov.com>
Co-authored-by: Markus Siglreithmaier <m.siglreith@gmail.com>

src/platform_impl/linux/mod.rs

@@ -464,6 +464,11 @@ impl Window {
         x11_or_wayland!(match self; Window(w) => w.set_minimized(minimized))
     }
 
+    #[inline]
+    pub fn is_minimized(&self) -> Option<bool> {
+        x11_or_wayland!(match self; Window(w) => w.is_minimized())
+    }
+
     #[inline]
     pub(crate) fn fullscreen(&self) -> Option<Fullscreen> {
         x11_or_wayland!(match self; Window(w) => w.fullscreen())