Fix some lifecycle-related crashes.

app/src/main/java/org/thoughtcrime/securesms/util/views/CircularProgressMaterialButton.kt

@@ -82,6 +82,10 @@ class CircularProgressMaterialButton @JvmOverloads constructor(
   }
 
   private fun transformTo(state: State, animate: Boolean) {
+    if (!isAttachedToWindow) {
+      return
+    }
+
     if (state == currentState && state == requestedState) {
       return
     }