Added forced checks on view being attached to window before performing hiding on it

app/src/main/java/com/topjohnwu/magisk/ui/MainActivity.kt

@@ -148,6 +148,32 @@ open class MainActivity : BaseUIActivity<MainViewModel, ActivityMainMd2Binding>(
         val topView = binding.mainToolbarWrapper
         val bottomView = binding.mainBottomBar
 
+        if (
+            Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT &&
+            !binding.mainBottomBar.isAttachedToWindow
+        ) {
+            binding.mainBottomBar.viewTreeObserver.addOnWindowAttachListener(object :
+                ViewTreeObserver.OnWindowAttachListener {
+
+                init {
+                    val listener =
+                        binding.mainBottomBar.tag as? ViewTreeObserver.OnWindowAttachListener
+                    if (listener != null) {
+                        binding.mainBottomBar.viewTreeObserver.removeOnWindowAttachListener(listener)
+                    }
+                    binding.mainBottomBar.tag = this
+                }
+
+                override fun onWindowAttached() {
+                    requestNavigationHidden(hide)
+                }
+
+                override fun onWindowDetached() {
+                }
+            })
+            return
+        }
+
         val topParams = topView.layoutParams as? CoordinatorLayout.LayoutParams
         val bottomParams = bottomView.layoutParams as? CoordinatorLayout.LayoutParams