Version 3.4: Fix build with GCC.

- Send reactions to messages.
- Group and Channel admins can enable reactions in their chat
via '...' menu > Manage > Reactions.
- Select text when typing and choose 'Formatting > Spoiler' in
the context menu to hide some or all of the contents of a message.
- Click on the spoiler in chat to reveal its hidden text.
- Spoiler formatting hides text in chat,
as well as in the chat list and notifications.

.gitmodules

@@ -4,9 +4,6 @@
 [submodule "Telegram/ThirdParty/GSL"]
 	path = Telegram/ThirdParty/GSL
 	url = https://github.com/Microsoft/GSL.git
-[submodule "Telegram/ThirdParty/Catch"]
-	path = Telegram/ThirdParty/Catch
-	url = https://github.com/philsquared/Catch
 [submodule "Telegram/ThirdParty/xxHash"]
 	path = Telegram/ThirdParty/xxHash
 	url = https://github.com/Cyan4973/xxHash.git
@@ -31,9 +28,6 @@
 [submodule "Telegram/lib_ui"]
 	path = Telegram/lib_ui
 	url = https://github.com/desktop-app/lib_ui.git
-[submodule "Telegram/lib_rlottie"]
-	path = Telegram/lib_rlottie
-	url = https://github.com/desktop-app/lib_rlottie.git
 [submodule "Telegram/lib_lottie"]
 	path = Telegram/lib_lottie
 	url = https://github.com/desktop-app/lib_lottie.git

Telegram/CMakeLists.txt

@@ -153,8 +153,8 @@ PRIVATE
     api/api_user_privacy.h
     api/api_views.cpp
     api/api_views.h
-    api/api_who_read.cpp
-    api/api_who_read.h
+    api/api_who_reacted.cpp
+    api/api_who_reacted.h
     boxes/filters/edit_filter_box.cpp
     boxes/filters/edit_filter_box.h
     boxes/filters/edit_filter_chats_list.cpp
@@ -180,6 +180,8 @@ PRIVATE
     boxes/peers/edit_peer_history_visibility_box.h
     boxes/peers/edit_peer_permissions_box.cpp
     boxes/peers/edit_peer_permissions_box.h
+    boxes/peers/edit_peer_reactions.cpp
+    boxes/peers/edit_peer_reactions.h
     boxes/peers/edit_peer_requests_box.cpp
     boxes/peers/edit_peer_requests_box.h
     boxes/peers/edit_peer_type_box.cpp
@@ -445,6 +447,8 @@ PRIVATE
     data/data_media_types.h
     data/data_messages.cpp
     data/data_messages.h
+    data/data_message_reactions.cpp
+    data/data_message_reactions.h
     data/data_msg_id.h
     data/data_notify_settings.cpp
     data/data_notify_settings.h
@@ -619,6 +623,12 @@ PRIVATE
     history/view/media/history_view_theme_document.cpp
     history/view/media/history_view_web_page.h
     history/view/media/history_view_web_page.cpp
+    history/view/reactions/message_reactions_list.cpp
+    history/view/reactions/message_reactions_list.h
+    history/view/reactions/message_reactions_selector.cpp
+    history/view/reactions/message_reactions_selector.h
+    history/view/history_view_bottom_info.cpp
+    history/view/history_view_bottom_info.h
     history/view/history_view_contact_status.cpp
     history/view/history_view_contact_status.h
     history/view/history_view_context_menu.cpp
@@ -633,6 +643,7 @@ PRIVATE
     history/view/history_view_empty_list_bubble.h
     history/view/history_view_group_call_bar.cpp
     history/view/history_view_group_call_bar.h
+    history/view/history_view_item_preview.h
     history/view/history_view_list_widget.cpp
     history/view/history_view_list_widget.h
     history/view/history_view_message.cpp
@@ -644,6 +655,10 @@ PRIVATE
     history/view/history_view_pinned_section.h
     history/view/history_view_pinned_tracker.cpp
     history/view/history_view_pinned_tracker.h
+    history/view/history_view_react_button.cpp
+    history/view/history_view_react_button.h
+    history/view/history_view_reactions.cpp
+    history/view/history_view_reactions.h
     history/view/history_view_replies_section.cpp
     history/view/history_view_replies_section.h
     history/view/history_view_requests_bar.cpp
@@ -656,6 +671,8 @@ PRIVATE
     history/view/history_view_send_action.h
     history/view/history_view_service_message.cpp
     history/view/history_view_service_message.h
+    history/view/history_view_spoiler_click_handler.cpp
+    history/view/history_view_spoiler_click_handler.h
     history/view/history_view_top_bar_widget.cpp
     history/view/history_view_top_bar_widget.h
     history/view/history_view_view_button.cpp

Telegram/Resources/export_html/css/style.css

@@ -531,3 +531,16 @@ div.toast_shown {
     background-image: url(../images/media_video@2x.png)
 }
 }
+
+.spoiler {
+    background: #e8e8e8;
+}
+.spoiler.hidden {
+    background: #a9a9a9;
+    cursor: pointer;
+    border-radius: 3px;
+}
+.spoiler.hidden span {
+    opacity: 0;
+    user-select: none;
+}

Telegram/Resources/export_html/js/script.js

@@ -52,6 +52,12 @@ function ShowMentionName() {
     return false;
 }
 
+function ShowSpoiler(target) {
+    if (target.classList.contains("hidden")) {
+        target.classList.toggle("hidden");
+    }
+}
+
 function AddClass(element, name) {
     var current = element.className;
     var expression = new RegExp('(^|\\s)' + name + '(\\s|$)', 'g');