Support gallery messages (#6519)

* Support gallery messages

* Address review

* Remove unused function

* Fix indent

* Add "Gallery" message prefix

* Support galleries for image editing

* Fix tapping on a tile opens the last item

* Fix overflow count

* Add caption editing to gallery messages

* Use the new gallery string for prefix

* Lock sending galleries behind a feature flag

* Fix detekts

* Fix

* Ensure image edition is saved when navigating

* Fix sending media broken on edited gallery.

* Fix tests

* Order imports

* Remove unused parameters.

* Fix copyright header of new files.

* Fix Konsist test

* Extract new previews to a dedicated file.

* Sync strings

* Remove unused import

* Update screenshots

* Trigger CI

* Remove parameters with default value.

* More cleanup

* Restore sendAsFile behavior.

* Improve Preview.

* Improve Preview.

* Improve Preview.

* Fix gallery sending cancel and retry issue

* Ensure any previous job is cancelled.

* Fix issue in summary message

* Gallery feature is disabled by default.

* Kotlin convention

* Remove useless parenthesis

* Update screenshots

* Fix test

* List -> ImmutableList

* Remove useless code.

* Render formatted caption for attachment list.

* Replace set of Booleans by an enum

* Remove unused model for individual caption in a gallery Event.

* Fix tests

* Fix tests

* Rework MediaViewer entry point.

And ensure that the clicked image from the gallery is displayed first.

* Ensure gallery item can be click in the pinned message list
Improve the gallery item click handling code.

* Improve code and fix separator color
Closes #7101

* React on attachment item click
Improve code

* Improve code and support 0 items in gallery.

* Fix click on attachment item not rendering anything.

---------

Co-authored-by: Benoit Marty <benoitm@element.io>
Co-authored-by: Benoit Marty <benoit@matrix.org>
Co-authored-by: ElementBot <android@element.io>

libraries/mediaupload/api/src/main/kotlin/io/element/android/libraries/mediaupload/api/MediaSender.kt

@@ -61,5 +61,12 @@ interface MediaSender {
         inReplyToEventId: EventId? = null,
     ): Result<Unit>
 
+    suspend fun sendGallery(
+        mediaUploadInfos: List<MediaUploadInfo>,
+        caption: String?,
+        formattedCaption: String?,
+        inReplyToEventId: EventId?,
+    ): Result<Unit>
+
     fun cleanUp()
 }

libraries/mediaupload/api/src/main/kotlin/io/element/android/libraries/mediaupload/api/MediaUploadInfo.kt

@@ -10,6 +10,7 @@ package io.element.android.libraries.mediaupload.api
 
 import io.element.android.libraries.matrix.api.media.AudioInfo
 import io.element.android.libraries.matrix.api.media.FileInfo
+import io.element.android.libraries.matrix.api.media.GalleryItemInfo
 import io.element.android.libraries.matrix.api.media.ImageInfo
 import io.element.android.libraries.matrix.api.media.VideoInfo
 import java.io.File
@@ -31,3 +32,30 @@ fun MediaUploadInfo.allFiles(): List<File> {
         (this@allFiles as? MediaUploadInfo.Video)?.thumbnailFile,
     )
 }
+
+fun MediaUploadInfo.toGalleryItemInfo(): GalleryItemInfo {
+    return when (this) {
+        is MediaUploadInfo.Image -> GalleryItemInfo.Image(
+            file = file,
+            imageInfo = imageInfo,
+            thumbnailFile = thumbnailFile,
+        )
+        is MediaUploadInfo.Video -> GalleryItemInfo.Video(
+            file = file,
+            videoInfo = videoInfo,
+            thumbnailFile = thumbnailFile,
+        )
+        is MediaUploadInfo.Audio -> GalleryItemInfo.Audio(
+            file = file,
+            audioInfo = audioInfo,
+        )
+        is MediaUploadInfo.VoiceMessage -> GalleryItemInfo.Audio(
+            file = file,
+            audioInfo = audioInfo,
+        )
+        is MediaUploadInfo.AnyFile -> GalleryItemInfo.MediaFile(
+            file = file,
+            fileInfo = fileInfo,
+        )
+    }
+}