Use custom xdg-shell fork for shadows on Wayland

Author: ilya-fedin

.gitmodules

@@ -94,3 +94,6 @@
 [submodule "Telegram/ThirdParty/mallocng"]
 	path = Telegram/ThirdParty/mallocng
 	url = https://github.com/desktop-app/mallocng.git
+[submodule "Telegram/lib_waylandshells"]
+	path = Telegram/lib_waylandshells
+	url = https://github.com/desktop-app/lib_waylandshells.git

Telegram/CMakeLists.txt

@@ -18,6 +18,9 @@ endif()
 add_subdirectory(lib_storage)
 add_subdirectory(lib_lottie)
 add_subdirectory(lib_qr)
+if (LINUX AND NOT DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION)
+    add_subdirectory(lib_waylandshells)
+endif()
 add_subdirectory(lib_webrtc)
 add_subdirectory(lib_webview)
 add_subdirectory(codegen)
@@ -110,6 +113,7 @@ elseif (LINUX)
     if (NOT DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION)
         target_link_libraries(Telegram
         PRIVATE
+            desktop-app::lib_waylandshells
             desktop-app::external_kwayland
         )
     endif()

Telegram/build/docker/centos_env/Dockerfile

@@ -771,6 +771,7 @@ RUN cmake3 --build out/Debug -- -j$(nproc)
 
 FROM builder
 
+COPY --from=extra-cmake-modules ${LibrariesPath}/extra-cmake-modules-cache /
 COPY --from=libffi ${LibrariesPath}/libffi-cache /
 COPY --from=xz ${LibrariesPath}/xz-cache /
 COPY --from=libproxy ${LibrariesPath}/libproxy-cache /