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>

tests/konsist/src/test/kotlin/io/element/android/tests/konsist/KonsistClassNameTest.kt

@@ -140,7 +140,10 @@ class KonsistClassNameTest {
         Konsist.scopeFromProject()
             .classes()
             .withNameEndingWith("Impl")
-            .withoutName("MediaUploadHandlerImpl")
+            .withoutName(
+                "MediaUploadHandlerImpl",
+                "GalleryMediaUploadHandlerImpl",
+            )
             .assertEmpty(additionalMessage = "Class implementing interface should have name not end with 'Impl' but start with 'Default'")
     }
 

tests/konsist/src/test/kotlin/io/element/android/tests/konsist/KonsistPreviewTest.kt

@@ -149,6 +149,7 @@ class KonsistPreviewTest {
         "TimelineItemEventRowShieldPreview",
         "TimelineItemEventRowTimestampPreview",
         "TimelineItemEventRowUtdPreview",
+        "TimelineItemEventRowWithGalleryPreview",
         "TimelineItemEventRowWithManyReactionsPreview",
         "TimelineItemEventRowWithRRPreview",
         "TimelineItemEventRowWithReplyPreview",