update stored directories if a file is deleted from the thumbnails view

app/src/main/kotlin/com/simplemobiletools/gallery/activities/MainActivity.kt

@@ -13,7 +13,6 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.ViewGroup
 import android.widget.FrameLayout
-import com.google.gson.Gson
 import com.simplemobiletools.commons.dialogs.CreateNewFolderDialog
 import com.simplemobiletools.commons.dialogs.FilePickerDialog
 import com.simplemobiletools.commons.dialogs.NewAppDialog
@@ -167,7 +166,6 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
 
     override fun onPause() {
         super.onPause()
-        storeDirectories()
         directories_refresh_layout.isRefreshing = false
         mIsGettingDirs = false
         storeStateVariables()
@@ -616,9 +614,7 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
 
     private fun storeDirectories() {
         if (!config.temporarilyShowHidden && config.tempFolderPath.isEmpty()) {
-            val subList = mDirs.subList(0, Math.min(SAVE_DIRS_CNT, mDirs.size))
+            storeDirectoryItems(mDirs)
-            val directories = Gson().toJson(subList)
-            config.directories = directories
         }
     }
 

app/src/main/kotlin/com/simplemobiletools/gallery/activities/MediaActivity.kt

@@ -675,6 +675,8 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
             } else if (mMedia.isEmpty()) {
                 deleteDirectoryIfEmpty()
                 finish()
+            } else {
+                updateStoredDirectories()
             }
         }
     }

app/src/main/kotlin/com/simplemobiletools/gallery/extensions/Context.kt

@@ -14,9 +14,11 @@ import com.simplemobiletools.commons.extensions.getStringValue
 import com.simplemobiletools.commons.extensions.humanizePath
 import com.simplemobiletools.commons.helpers.OTG_PATH
 import com.simplemobiletools.gallery.activities.SettingsActivity
+import com.simplemobiletools.gallery.asynctasks.GetDirectoriesAsynctask
 import com.simplemobiletools.gallery.asynctasks.GetMediaAsynctask
 import com.simplemobiletools.gallery.helpers.Config
 import com.simplemobiletools.gallery.helpers.NOMEDIA
+import com.simplemobiletools.gallery.helpers.SAVE_DIRS_CNT
 import com.simplemobiletools.gallery.helpers.SAVE_MEDIA_CNT
 import com.simplemobiletools.gallery.models.Directory
 import com.simplemobiletools.gallery.models.Medium
@@ -148,3 +150,17 @@ fun Context.storeFolderItems(path: String, items: ArrayList<Medium>) {
     } catch (ignored: OutOfMemoryError) {
     }
 }
+
+fun Context.updateStoredDirectories() {
+    GetDirectoriesAsynctask(this, false, false) {
+        if (!config.temporarilyShowHidden) {
+            storeDirectoryItems(it)
+        }
+    }.execute()
+}
+
+fun Context.storeDirectoryItems(items: ArrayList<Directory>) {
+    val subList = items.subList(0, Math.min(SAVE_DIRS_CNT, items.size))
+    val directories = Gson().toJson(subList)
+    config.directories = directories
+}