Merge pull request #1789 from RocketChat/fix/gif-upload

[FIX] Gif files not being animated.

app/src/main/java/chat/rocket/android/chatroom/ui/Dialog.kt

@@ -7,6 +7,7 @@ import androidx.core.view.isVisible
 import chat.rocket.android.emoji.internal.GlideApp
 import chat.rocket.android.util.extensions.getFileName
 import chat.rocket.android.util.extensions.getMimeType
+import com.bumptech.glide.load.resource.gif.GifDrawable
 import com.bumptech.glide.request.target.SimpleTarget
 import com.bumptech.glide.request.transition.Transition
 
@@ -21,6 +22,15 @@ fun ChatRoomFragment.showFileAttachmentDialog(uri: Uri) {
             description.text.clear()
             when {
                 mimeType.startsWith("image") -> {
+                    if (mimeType.contains("gif")) {
+                        GlideApp
+                            .with(context)
+                            .asGif()
+                            .load(uri)
+                            .override(imagePreview.width, imagePreview.height)
+                            .fitCenter()
+                            .into(imagePreview)
+                    } else {
                         GlideApp
                             .with(context)
                             .asBitmap()
@@ -34,10 +44,11 @@ fun ChatRoomFragment.showFileAttachmentDialog(uri: Uri) {
                                 ) {
                                     bitmap = resource
                                     imagePreview.setImageBitmap(resource)
-                                imagePreview.isVisible = true
                                 }
                             })
                     }
+                    imagePreview.isVisible = true
+                }
                 mimeType.startsWith("video") -> audioVideoAttachment.isVisible = true
                 else -> {
                     textFile.isVisible = true