fix #937, set Image as the default file type

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

@@ -88,11 +88,11 @@ open class PhotoVideoActivity : SimpleActivity(), ViewPagerFragment.FragmentList
         val file = File(mUri.toString())
         val filename = getFilenameFromUri(mUri!!)
         val type = when {
-            filename.isImageFast() -> TYPE_IMAGES
             filename.isVideoFast() -> TYPE_VIDEOS
             filename.isGif() -> TYPE_GIFS
             filename.isRawFast() -> TYPE_RAWS
-            else -> TYPE_SVGS
+            filename.isSvg() -> TYPE_SVGS
+            else -> TYPE_IMAGES
         }
 
         mMedium = Medium(null, filename, mUri.toString(), mUri!!.path.getParentPath(), 0, 0, file.length(), type, false, 0L)

app/src/main/kotlin/com/simplemobiletools/gallery/adapters/DirectoryAdapter.kt

@@ -521,11 +521,11 @@ class DirectoryAdapter(activity: BaseSimpleActivity, var dirs: ArrayList<Directo
             dir_path?.text = "${directory.path.substringBeforeLast("/")}/"
             photo_cnt.text = directory.mediaCnt.toString()
             val thumbnailType = when {
-                directory.tmb.isImageFast() -> TYPE_IMAGES
                 directory.tmb.isVideoFast() -> TYPE_VIDEOS
                 directory.tmb.isGif() -> TYPE_GIFS
                 directory.tmb.isRawFast() -> TYPE_RAWS
-                else -> TYPE_SVGS
+                directory.tmb.isSvg() -> TYPE_SVGS
+                else -> TYPE_IMAGES
             }
 
             activity.loadImage(thumbnailType, directory.tmb, dir_thumbnail, scrollHorizontally, animateGifs, cropThumbnails)

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

@@ -237,11 +237,11 @@ class MediaFetcher(val context: Context) {
                 }
 
                 val type = when {
-                    isImage -> TYPE_IMAGES
                     isVideo -> TYPE_VIDEOS
                     isGif -> TYPE_GIFS
                     isRaw -> TYPE_RAWS
-                    else -> TYPE_SVGS
+                    isSvg -> TYPE_SVGS
+                    else -> TYPE_IMAGES
                 }
 
                 val isFavorite = favoritePaths.contains(path)
@@ -299,11 +299,11 @@ class MediaFetcher(val context: Context) {
             val dateModified = file.lastModified()
 
             val type = when {
-                isImage -> TYPE_IMAGES
                 isVideo -> TYPE_VIDEOS
                 isGif -> TYPE_GIFS
                 isRaw -> TYPE_RAWS
-                else -> TYPE_SVGS
+                isSvg -> TYPE_SVGS
+                else -> TYPE_IMAGES
             }
 
             val path = Uri.decode(file.uri.toString().replaceFirst("${context.config.OTGTreeUri}/document/${context.config.OTGPartition}%3A", OTG_PATH))

app/src/main/kotlin/com/simplemobiletools/gallery/receivers/RefreshMediaReceiver.kt

@@ -22,10 +22,10 @@ class RefreshMediaReceiver : BroadcastReceiver() {
     }
 
     private fun getFileType(path: String) = when {
-        path.isImageFast() -> TYPE_IMAGES
         path.isVideoFast() -> TYPE_VIDEOS
         path.isGif() -> TYPE_GIFS
         path.isRawFast() -> TYPE_RAWS
-        else -> TYPE_SVGS
+        path.isSvg() -> TYPE_SVGS
+        else -> TYPE_IMAGES
     }
 }