Merge branch 'fix/fragment-gone' into 'master'

Prevent crash when trying to set Activity (sub)title from detached fragment

See merge request fmasa/wfrp-master!112

Author: fmasa

app/src/main/java/cz/muni/fi/rpg/ui/common/BaseFragment.kt

@@ -9,22 +9,14 @@ abstract class BaseFragment(@LayoutRes contentLayoutId: Int) : Fragment(contentL
      * Set title of parent activity's action bar
      */
     protected fun setTitle(title: String) {
-        val activity = requireActivity()
-
-        if (activity is AppCompatActivity) {
-            activity.supportActionBar?.title = title
-        }
+        activity?.let { (activity as AppCompatActivity).supportActionBar?.title = title }
     }
 
     /**
      * Set subtitle of parent activity's action bar
      * Note: This is not really optimal way to do this, but I did not found another one
      */
     protected fun setSubtitle(subtitle: String) {
-        val activity = requireActivity()
-
-        if (activity is AppCompatActivity) {
-            activity.supportActionBar?.subtitle = subtitle
-        }
+        activity?.let { (activity as AppCompatActivity).supportActionBar?.subtitle = subtitle }
     }
 }