add recycle bin to pinned folders by default

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

@@ -114,6 +114,11 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
             config.addPinnedFolders(hashSetOf(FAVORITES))
             config.wereFavoritesPinned = true
         }
+
+        if (!config.wasRecycleBinPinned) {
+            config.addPinnedFolders(hashSetOf(RECYCLE_BIN))
+            config.wasRecycleBinPinned = true
+        }
     }
 
     override fun onStart() {

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Config.kt

@@ -349,6 +349,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getBoolean(WERE_FAVORITES_PINNED, false)
         set(wereFavoritesPinned) = prefs.edit().putBoolean(WERE_FAVORITES_PINNED, wereFavoritesPinned).apply()
 
+    var wasRecycleBinPinned: Boolean
+        get() = prefs.getBoolean(WAS_RECYCLE_BIN_PINNED, false)
+        set(wasRecycleBinPinned) = prefs.edit().putBoolean(WAS_RECYCLE_BIN_PINNED, wasRecycleBinPinned).apply()
+
     var groupBy: Int
         get() = prefs.getInt(GROUP_BY, GROUP_BY_NONE)
         set(groupBy) = prefs.edit().putInt(GROUP_BY, groupBy).apply()

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Constants.kt

@@ -51,6 +51,7 @@ const val WAS_OTG_HANDLED = "was_otg_handled"
 const val TEMP_SKIP_DELETE_CONFIRMATION = "temp_skip_delete_confirmation"
 const val BOTTOM_ACTIONS = "bottom_actions"
 const val WERE_FAVORITES_PINNED = "were_favorites_pinned"
+const val WAS_RECYCLE_BIN_PINNED = "was_recycle_bin_pinned"
 const val GROUP_BY = "group_by"
 
 // slideshow
@@ -67,6 +68,7 @@ const val SLIDESHOW_SCROLL_DURATION = 500L
 
 const val NOMEDIA = ".nomedia"
 const val FAVORITES = "favorites"
+const val RECYCLE_BIN = "recycle_bin"
 const val SHOW_FAVORITES = "show_favorites"
 const val MAX_COLUMN_COUNT = 20
 const val SHOW_TEMP_HIDDEN_DURATION = 300000L