scan the included folder after adding on a background thread

app/build.gradle

@@ -42,7 +42,7 @@ ext {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.3.7'
+    implementation 'com.simplemobiletools:commons:3.3.9'
     implementation 'com.davemorrissey.labs:subsampling-scale-image-view:3.9.0'
     implementation 'com.theartofdev.edmodo:android-image-cropper:2.4.0'
     implementation 'com.android.support:multidex:1.0.2'

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

@@ -52,7 +52,9 @@ class IncludedFoldersActivity : SimpleActivity(), RefreshRecyclerViewListener {
         FilePickerDialog(this, pickFile = false, showHidden = config.shouldShowHidden) {
             config.addIncludedFolder(it)
             updateIncludedFolders()
-            scanPath(it)
+            Thread {
+                scanPath(it)
+            }.start()
         }
     }
 }