fix #618, properly refresh menu items when appropriate

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/activities/MainActivity.kt

@@ -145,7 +145,7 @@ class MainActivity : SimpleActivity() {
         config.temporarilyShowHidden = false
     }
 
-    private fun refreshMenuItems() {
+    fun refreshMenuItems() {
         val currentFragment = getCurrentFragment() ?: return
         val currentViewType = config.getFolderViewType(currentFragment.currentPath)
         val favorites = config.favorites

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/activities/MimeTypesActivity.kt

@@ -351,6 +351,7 @@ class MimeTypesActivity : SimpleActivity(), ItemOperationsListener {
         ChangeViewTypeDialog(this, currentMimeType, true) {
             recreateList()
             setupLayoutManager()
+            refreshMenuItems()
         }
     }
 
@@ -375,7 +376,7 @@ class MimeTypesActivity : SimpleActivity(), ItemOperationsListener {
     }
 
     private fun columnCountChanged() {
-        invalidateOptionsMenu()
+        refreshMenuItems()
         getRecyclerAdapter()?.apply {
             notifyItemRangeChanged(0, listItems.size)
         }

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/fragments/ItemsFragment.kt

@@ -115,7 +115,7 @@ class ItemsFragment(context: Context, attributeSet: AttributeSet) : MyViewPagerF
 
             itemsIgnoringSearch = listItems
             activity?.runOnUiThread {
-                activity?.invalidateOptionsMenu()
+                (activity as? MainActivity)?.refreshMenuItems()
                 addItems(listItems, forceRefresh)
                 if (context != null && currentViewType != context!!.config.getFolderViewType(currentPath)) {
                     setupLayoutManager()
@@ -492,7 +492,7 @@ class ItemsFragment(context: Context, attributeSet: AttributeSet) : MyViewPagerF
     }
 
     private fun columnCountChanged() {
-        activity?.invalidateOptionsMenu()
+        (activity as? MainActivity)?.refreshMenuItems()
         getRecyclerAdapter()?.apply {
             notifyItemRangeChanged(0, listItems.size)
         }

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/fragments/RecentsFragment.kt

@@ -188,7 +188,7 @@ class RecentsFragment(context: Context, attributeSet: AttributeSet) : MyViewPage
     }
 
     private fun columnCountChanged() {
-        activity?.invalidateOptionsMenu()
+        (activity as? MainActivity)?.refreshMenuItems()
         getRecyclerAdapter()?.apply {
             notifyItemRangeChanged(0, listItems.size)
         }