diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bcfeae49a..3b44061c9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -62,10 +62,8 @@ jobs:
         fi
 
         if [[ "${{ matrix.ui }}" == "gui" ]] ; then
-          export enable_ui=on
           export laf_backend=skia
         else
-          export enable_ui=off
           export laf_backend=none
         fi
 
@@ -85,7 +83,6 @@ jobs:
           -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \
           -DCMAKE_OSX_DEPLOYMENT_TARGET=10.9 \
           -DENABLE_TESTS=ON \
-          -DENABLE_UI=$enable_ui \
           -DENABLE_SCRIPTING=$enable_scripting \
           -DENABLE_CCACHE=$enable_ccache \
           -DLAF_BACKEND=$laf_backend \
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a3d11de09..c634cecf0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,7 +59,6 @@ option(ENABLE_TRIAL_MODE   "Compile the trial version" off)
 option(ENABLE_DRM          "Compile the DRM-enabled version (e.g. for automatic updates)" off)
 option(ENABLE_STEAM        "Compile with Steam library" off)
 option(ENABLE_DEVMODE      "Compile vesion for developers" off)
-option(ENABLE_UI           "Compile UI (turn off to compile CLI-only version)" on)
 option(ENABLE_I18N_STRINGS "Clone i18n strings repo (https://github.com/aseprite/strings) to bin/data/strings.git" off)
 option(FULLSCREEN_PLATFORM "Enable fullscreen by default" off)
 option(ENABLE_CLANG_TIDY   "Enable static analysis" off)
@@ -98,12 +97,9 @@ if(REQUIRE_CURL AND NOT USE_SHARED_CURL)
   endif()
 endif()
 
-if(NOT LAF_OS_BACKEND)
-  if(NOT ENABLE_UI)
-    set(LAF_OS_BACKEND "none") # Without UI, we use the none backend
-  else()
-    set(LAF_OS_BACKEND "skia")
-  endif()
+# By default we'll try to use Skia back-end
+if(NOT LAF_BACKEND)
+  set(LAF_BACKEND "skia")
 endif()
 
 if(ENABLE_DRM AND NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/drm/CMakeLists.txt)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index baa16672d..58e68673f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -16,7 +16,7 @@ endif()
 if(MSVC)
   # As Skia is compiled with /GL flag (whole program optimization),
   # the linker prefer a /LTCG parameter to improve link times.
-  if(LAF_OS_BACKEND STREQUAL "skia")
+  if(LAF_BACKEND STREQUAL "skia")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LTCG")
   endif()
 
@@ -183,7 +183,7 @@ if(ENABLE_ASEPRITE_EXE)
   add_executable(${main_target}
     main/main.cpp
     ${main_resources})
-  if(ENABLE_UI)
+  if(LAF_BACKEND STREQUAL "skia")
     if(WIN32)
       set_target_properties(${main_target} PROPERTIES WIN32_EXECUTABLE true)
     endif()
@@ -192,9 +192,9 @@ if(ENABLE_ASEPRITE_EXE)
   target_link_libraries(${main_target} app-lib)
   add_dependencies(${main_target} copy_data)
 
-  if(LAF_OS_BACKEND_LINK_FLAGS)
+  if(LAF_BACKEND_LINK_FLAGS)
     set_target_properties(${main_target} PROPERTIES LINK_FLAGS
-      ${LAF_OS_BACKEND_LINK_FLAGS})
+      ${LAF_BACKEND_LINK_FLAGS})
   endif()
 
   install(TARGETS ${main_target}
diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index 7b0668b43..8d92b674e 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -95,6 +95,10 @@ add_definitions(-DLIBARCHIVE_STATIC)
 
 add_library(app-lib ${generated_files})
 
+# ENABLE_UI is always defined because there are still #ifdef/endif
+# using it, but we should remove it.
+target_compile_definitions(app-lib PUBLIC -DENABLE_UI)
+
 # These specific-platform files should be in an external library
 # (e.g. "base" or "os").
 if(WIN32)
@@ -113,7 +117,7 @@ else()
 endif()
 
 # Data recovery
-if(ENABLE_UI AND (NOT ENABLE_TRIAL_MODE OR ENABLE_DRM))
+if(NOT ENABLE_TRIAL_MODE OR ENABLE_DRM)
   set(ENABLE_DATA_RECOVERY on)
 else()
   set(ENABLE_DATA_RECOVERY off)
@@ -170,14 +174,6 @@ if(ENABLE_SCRIPTING)
   target_link_libraries(app-lib lua lauxlib lualib)
   target_compile_definitions(app-lib PUBLIC -DENABLE_SCRIPTING)
 
-  if(ENABLE_UI)
-    target_sources(app-lib PRIVATE
-      commands/cmd_developer_console.cpp
-      commands/cmd_open_script_folder.cpp
-      commands/debugger.cpp
-      ui/devconsole_view.cpp)
-  endif()
-
   if(ENABLE_WEBSOCKET)
     target_link_libraries(app-lib ixwebsocket)
     target_compile_definitions(app-lib PUBLIC -DENABLE_WEBSOCKET)
@@ -186,11 +182,14 @@ if(ENABLE_SCRIPTING)
   endif()
 
   target_sources(app-lib PRIVATE
+    commands/cmd_developer_console.cpp
+    commands/cmd_open_script_folder.cpp
     commands/cmd_run_script.cpp
+    commands/debugger.cpp
     script/app_command_object.cpp
     script/app_fs_object.cpp
-    script/app_os_object.cpp
     script/app_object.cpp
+    script/app_os_object.cpp
     script/app_theme_object.cpp
     script/brush_class.cpp
     script/canvas_widget.cpp
@@ -245,249 +244,23 @@ if(ENABLE_SCRIPTING)
     script/values.cpp
     script/version_class.cpp
     script/window_class.cpp
-    shell.cpp)
-endif()
-
-# UI-only files
-if(ENABLE_UI)
-  target_compile_definitions(app-lib PUBLIC -DENABLE_UI)
-  target_sources(app-lib PRIVATE
-    app_brushes.cpp
-    app_menus.cpp
-    closed_docs.cpp
-    commands/cmd_about.cpp
-    commands/cmd_advanced_mode.cpp
-    commands/cmd_cancel.cpp
-    commands/cmd_cel_properties.cpp
-    commands/cmd_change_brush.cpp
-    commands/cmd_change_color.cpp
-    commands/cmd_clear.cpp
-    commands/cmd_clear_cel.cpp
-    commands/cmd_clear_recent_files.cpp
-    commands/cmd_close_file.cpp
-    commands/cmd_contiguous_fill.cpp
-    commands/cmd_copy.cpp
-    commands/cmd_copy_cel.cpp
-    commands/cmd_copy_merged.cpp
-    commands/cmd_cut.cpp
-    commands/cmd_discard_brush.cpp
-    commands/cmd_duplicate_layer.cpp
-    commands/cmd_duplicate_sprite.cpp
-    commands/cmd_duplicate_view.cpp
-    commands/cmd_exit.cpp
-    commands/cmd_eyedropper.cpp
-    commands/cmd_fit_screen.cpp
-    commands/cmd_frame_properties.cpp
-    commands/cmd_frame_tag_properties.cpp
-    commands/cmd_fullscreen_mode.cpp
-    commands/cmd_fullscreen_preview.cpp
-    commands/cmd_goto_frame.cpp
-    commands/cmd_goto_layer.cpp
-    commands/cmd_goto_tab.cpp
-    commands/cmd_grid.cpp
-    commands/cmd_home.cpp
-    commands/cmd_invert_mask.cpp
-    commands/cmd_keyboard_shortcuts.cpp
-    commands/cmd_launch.cpp
-    commands/cmd_layer_lock.cpp
-    commands/cmd_layer_opacity.cpp
-    commands/cmd_layer_properties.cpp
-    commands/cmd_layer_visibility.cpp
-    commands/cmd_link_cels.cpp
-    commands/cmd_load_mask.cpp
-    commands/cmd_mask_by_color.cpp
-    commands/cmd_mask_content.cpp
-    commands/cmd_modify_selection.cpp
-    commands/cmd_move_cel.cpp
-    commands/cmd_move_mask.cpp
-    commands/cmd_new_brush.cpp
-    commands/cmd_new_frame_tag.cpp
-    commands/cmd_new_sprite_from_selection.cpp
-    commands/cmd_onionskin.cpp
-    commands/cmd_open_browser.cpp
-    commands/cmd_open_group.cpp
-    commands/cmd_open_in_folder.cpp
-    commands/cmd_open_with_app.cpp
-    commands/cmd_options.cpp
-    commands/cmd_palette_editor.cpp
-    commands/cmd_paste.cpp
-    commands/cmd_paste_text.cpp
-    commands/cmd_pixel_perfect_mode.cpp
-    commands/cmd_play_animation.cpp
-    commands/cmd_refresh.cpp
-    commands/cmd_enter_license.cpp
-    commands/cmd_remove_frame.cpp
-    commands/cmd_remove_frame_tag.cpp
-    commands/cmd_remove_slice.cpp
-    commands/cmd_reopen_closed_file.cpp
-    commands/cmd_repeat_last_export.cpp
-    commands/cmd_reselect_mask.cpp
-    commands/cmd_reverse_frames.cpp
-    commands/cmd_rotate.cpp
-    commands/cmd_save_mask.cpp
-    commands/cmd_save_palette.cpp
-    commands/cmd_select_palette.cpp
-    commands/cmd_scroll.cpp
-    commands/cmd_scroll_center.cpp
-    commands/cmd_select_tile.cpp
-    commands/cmd_set_color_selector.cpp
-    commands/cmd_set_ink_type.cpp
-    commands/cmd_set_loop_section.cpp
-    commands/cmd_set_palette.cpp
-    commands/cmd_set_palette_entry_size.cpp
-    commands/cmd_set_same_ink.cpp
-    commands/cmd_slice_properties.cpp
-    commands/cmd_sprite_properties.cpp
-    commands/cmd_swap_checkerboard_colors.cpp
-    commands/cmd_switch_colors.cpp
-    commands/cmd_symmetry_mode.cpp
-    commands/cmd_tiled_mode.cpp
-    commands/cmd_timeline.cpp
-    commands/cmd_toggle_preview.cpp
-    commands/cmd_toggle_tiles_mode.cpp
-    commands/cmd_toggle_timeline_thumbnails.cpp
-    commands/cmd_undo_history.cpp
-    commands/cmd_unlink_cel.cpp
-    commands/cmd_zoom.cpp
-    commands/filters/filter_preview.cpp
-    commands/filters/filter_target_buttons.cpp
-    commands/filters/filter_window.cpp
-    commands/screenshot.cpp
-    commands/set_playback_speed.cpp
-    commands/show_menu.cpp
-    commands/tileset_mode.cpp
-    commands/toggle_other_layers_opacity.cpp
-    commands/toggle_play_option.cpp
-    file_selector.cpp
-    modules/gfx.cpp
-    modules/gui.cpp
-    ui/alpha_entry.cpp
-    ui/alpha_slider.cpp
-    ui/app_menuitem.cpp
-    ui/backup_indicator.cpp
-    ui/browser_view.cpp
-    ui/brush_popup.cpp
-    ui/button_set.cpp
-    ui/color_bar.cpp
-    ui/color_button.cpp
-    ui/color_popup.cpp
-    ui/color_selector.cpp
-    ui/color_shades.cpp
-    ui/color_sliders.cpp
-    ui/color_spectrum.cpp
-    ui/color_tint_shade_tone.cpp
-    ui/color_wheel.cpp
-    ui/configure_timeline_popup.cpp
-    ui/context_bar.cpp
-    ui/dithering_selector.cpp
-    ui/doc_view.cpp
-    ui/drop_down_button.cpp
-    ui/dynamics_popup.cpp
-    ui/editor/brush_preview.cpp
-    ui/editor/delayed_mouse_move.cpp
-    ui/editor/dragging_value_state.cpp
-    ui/editor/drawing_state.cpp
-    ui/editor/editor.cpp
-    ui/editor/editor_observers.cpp
-    ui/editor/editor_render.cpp
-    ui/editor/editor_states_history.cpp
-    ui/editor/editor_view.cpp
-    ui/editor/moving_cel_state.cpp
-    ui/editor/moving_pixels_state.cpp
-    ui/editor/moving_selection_state.cpp
-    ui/editor/moving_slice_state.cpp
-    ui/editor/moving_symmetry_state.cpp
-    ui/editor/navigate_state.cpp
-    ui/editor/pivot_helpers.cpp
-    ui/editor/pixels_movement.cpp
-    ui/editor/play_state.cpp
-    ui/editor/scrolling_state.cpp
-    ui/editor/select_box_state.cpp
-    ui/editor/standby_state.cpp
-    ui/editor/state_with_wheel_behavior.cpp
-    ui/editor/transform_handles.cpp
-    ui/editor/zooming_state.cpp
-    ui/export_file_window.cpp
-    ui/expr_entry.cpp
-    ui/file_list.cpp
-    ui/file_list_view.cpp
-    ui/file_selector.cpp
-    ui/filename_field.cpp
-    ui/font_popup.cpp
-    ui/hex_color_entry.cpp
-    ui/home_view.cpp
-    ui/icon_button.cpp
-    ui/incompat_file_window.cpp
-    ui/input_chain.cpp
-    ui/keyboard_shortcuts.cpp
-    ui/main_menu_bar.cpp
-    ui/main_window.cpp
-    ui/mini_help_button.cpp
-    ui/notifications.cpp
-    ui/optional_alert.cpp
-    ui/palette_popup.cpp
-    ui/palette_view.cpp
-    ui/palettes_listbox.cpp
-    ui/popup_window_pin.cpp
-    ui/pref_widget.cpp
-    ui/preview_editor.cpp
-    ui/recent_listbox.cpp
-    ui/resources_listbox.cpp
-    ui/rgbmap_algorithm_selector.cpp
-    ui/sampling_selector.cpp
-    ui/search_entry.cpp
-    ui/select_accelerator.cpp
-    ui/selection_mode_field.cpp
-    ui/skin/font_data.cpp
-    ui/skin/skin_part.cpp
-    ui/skin/skin_property.cpp
-    ui/skin/skin_slider_property.cpp
-    ui/skin/skin_theme.cpp
-    ui/slice_window.cpp
-    ui/slider2.cpp
-    ui/status_bar.cpp
-    ui/tabs.cpp
-    ui/tag_window.cpp
-    ui/task_widget.cpp
-    ui/tile_button.cpp
-    ui/tileset_selector.cpp
-    ui/timeline/ani_controls.cpp
-    ui/timeline/timeline.cpp
-    ui/toolbar.cpp
-    ui/user_data_view.cpp
-    ui/workspace.cpp
-    ui/workspace_panel.cpp
-    ui/workspace_tabs.cpp
-    ui/zoom_entry.cpp
-    ui_context.cpp
-    widget_loader.cpp)
-  if(ENABLE_NEWS)
-    target_compile_definitions(app-lib PUBLIC -DENABLE_NEWS)
-    target_sources(app-lib PRIVATE
-      res/http_loader.cpp
-      ui/news_listbox.cpp)
-  endif()
-  if(ENABLE_DRM)
-    target_link_libraries(app-lib drm-lib)
-    target_compile_definitions(app-lib PUBLIC
-      -DENABLE_DRM
-      -DENABLE_SAVE)
-    target_sources(app-lib PRIVATE
-      ui/enter_license.cpp
-      ui/aseprite_update.cpp)
-  endif()
+    shell.cpp
+    ui/devconsole_view.cpp)
 endif()
 
 # Main app sources
 target_sources(app-lib PRIVATE
   active_site_handler.cpp
   app.cpp
+  app_brushes.cpp
+  app_menus.cpp
   check_update.cpp
   cli/app_options.cpp
   cli/cli_open_file.cpp
   cli/cli_processor.cpp
   cli/default_cli_delegate.cpp
   cli/preview_cli_delegate.cpp
+  closed_docs.cpp
   cmd.cpp
   cmd/add_cel.cpp
   cmd/add_frame.cpp
@@ -589,33 +362,127 @@ target_sources(app-lib PRIVATE
   color_picker.cpp
   color_spaces.cpp
   color_utils.cpp
+  commands/cmd_about.cpp
   commands/cmd_add_color.cpp
+  commands/cmd_advanced_mode.cpp
   commands/cmd_background_from_layer.cpp
+  commands/cmd_cancel.cpp
   commands/cmd_canvas_size.cpp
   commands/cmd_cel_opacity.cpp
+  commands/cmd_cel_properties.cpp
+  commands/cmd_change_brush.cpp
+  commands/cmd_change_color.cpp
   commands/cmd_change_pixel_format.cpp
+  commands/cmd_clear.cpp
+  commands/cmd_clear_cel.cpp
+  commands/cmd_clear_recent_files.cpp
+  commands/cmd_close_file.cpp
   commands/cmd_color_quantization.cpp
+  commands/cmd_contiguous_fill.cpp
+  commands/cmd_copy.cpp
+  commands/cmd_copy_cel.cpp
+  commands/cmd_copy_merged.cpp
   commands/cmd_crop.cpp
+  commands/cmd_cut.cpp
   commands/cmd_deselect_mask.cpp
+  commands/cmd_discard_brush.cpp
+  commands/cmd_duplicate_layer.cpp
+  commands/cmd_duplicate_sprite.cpp
+  commands/cmd_duplicate_view.cpp
+  commands/cmd_enter_license.cpp
+  commands/cmd_exit.cpp
   commands/cmd_export_sprite_sheet.cpp
+  commands/cmd_eyedropper.cpp
   commands/cmd_fill_and_stroke.cpp
+  commands/cmd_fit_screen.cpp
   commands/cmd_flatten_layers.cpp
   commands/cmd_flip.cpp
+  commands/cmd_frame_properties.cpp
+  commands/cmd_frame_tag_properties.cpp
+  commands/cmd_fullscreen_mode.cpp
+  commands/cmd_fullscreen_preview.cpp
+  commands/cmd_goto_frame.cpp
+  commands/cmd_goto_layer.cpp
+  commands/cmd_goto_tab.cpp
+  commands/cmd_grid.cpp
+  commands/cmd_home.cpp
   commands/cmd_import_sprite_sheet.cpp
+  commands/cmd_invert_mask.cpp
+  commands/cmd_keyboard_shortcuts.cpp
+  commands/cmd_launch.cpp
   commands/cmd_layer_from_background.cpp
+  commands/cmd_layer_lock.cpp
+  commands/cmd_layer_opacity.cpp
+  commands/cmd_layer_properties.cpp
+  commands/cmd_layer_visibility.cpp
+  commands/cmd_link_cels.cpp
+  commands/cmd_load_mask.cpp
   commands/cmd_load_palette.cpp
   commands/cmd_mask_all.cpp
+  commands/cmd_mask_by_color.cpp
+  commands/cmd_mask_content.cpp
   commands/cmd_merge_down_layer.cpp
+  commands/cmd_modify_selection.cpp
+  commands/cmd_move_cel.cpp
+  commands/cmd_move_mask.cpp
+  commands/cmd_new_brush.cpp
   commands/cmd_new_file.cpp
   commands/cmd_new_frame.cpp
+  commands/cmd_new_frame_tag.cpp
   commands/cmd_new_layer.cpp
+  commands/cmd_new_sprite_from_selection.cpp
+  commands/cmd_onionskin.cpp
+  commands/cmd_open_browser.cpp
   commands/cmd_open_file.cpp
+  commands/cmd_open_group.cpp
+  commands/cmd_open_in_folder.cpp
+  commands/cmd_open_with_app.cpp
+  commands/cmd_options.cpp
+  commands/cmd_palette_editor.cpp
   commands/cmd_palette_size.cpp
+  commands/cmd_paste.cpp
+  commands/cmd_paste_text.cpp
+  commands/cmd_pixel_perfect_mode.cpp
+  commands/cmd_play_animation.cpp
+  commands/cmd_refresh.cpp
+  commands/cmd_remove_frame.cpp
+  commands/cmd_remove_frame_tag.cpp
   commands/cmd_remove_layer.cpp
+  commands/cmd_remove_slice.cpp
+  commands/cmd_reopen_closed_file.cpp
+  commands/cmd_repeat_last_export.cpp
+  commands/cmd_reselect_mask.cpp
+  commands/cmd_reverse_frames.cpp
+  commands/cmd_rotate.cpp
   commands/cmd_save_file.cpp
+  commands/cmd_save_mask.cpp
+  commands/cmd_save_palette.cpp
+  commands/cmd_scroll.cpp
+  commands/cmd_scroll_center.cpp
+  commands/cmd_select_palette.cpp
+  commands/cmd_select_tile.cpp
+  commands/cmd_set_color_selector.cpp
+  commands/cmd_set_ink_type.cpp
+  commands/cmd_set_loop_section.cpp
+  commands/cmd_set_palette.cpp
+  commands/cmd_set_palette_entry_size.cpp
+  commands/cmd_set_same_ink.cpp
   commands/cmd_show.cpp
+  commands/cmd_slice_properties.cpp
+  commands/cmd_sprite_properties.cpp
   commands/cmd_sprite_size.cpp
+  commands/cmd_swap_checkerboard_colors.cpp
+  commands/cmd_switch_colors.cpp
+  commands/cmd_symmetry_mode.cpp
+  commands/cmd_tiled_mode.cpp
+  commands/cmd_timeline.cpp
+  commands/cmd_toggle_preview.cpp
+  commands/cmd_toggle_tiles_mode.cpp
+  commands/cmd_toggle_timeline_thumbnails.cpp
   commands/cmd_undo.cpp
+  commands/cmd_undo_history.cpp
+  commands/cmd_unlink_cel.cpp
+  commands/cmd_zoom.cpp
   commands/command.cpp
   commands/commands.cpp
   commands/convert_layer.cpp
@@ -632,12 +499,21 @@ target_sources(app-lib PRIVATE
   commands/filters/color_curve_editor.cpp
   commands/filters/convolution_matrix_stock.cpp
   commands/filters/filter_manager_impl.cpp
+  commands/filters/filter_preview.cpp
+  commands/filters/filter_target_buttons.cpp
+  commands/filters/filter_window.cpp
   commands/filters/filter_worker.cpp
   commands/move_colors_command.cpp
   commands/move_thing.cpp
   commands/move_tiles_command.cpp
   commands/new_params.cpp
   commands/quick_command.cpp
+  commands/screenshot.cpp
+  commands/set_playback_speed.cpp
+  commands/show_menu.cpp
+  commands/tileset_mode.cpp
+  commands/toggle_other_layers_opacity.cpp
+  commands/toggle_play_option.cpp
   console.cpp
   context.cpp
   context_flags.cpp
@@ -658,6 +534,7 @@ target_sources(app-lib PRIVATE
   file/file_op_config.cpp
   file/palette_file.cpp
   file/split_filename.cpp
+  file_selector.cpp
   file_system.cpp
   filename_formatter.cpp
   flatten.cpp
@@ -672,6 +549,8 @@ target_sources(app-lib PRIVATE
   log.cpp
   loop_tag.cpp
   modules.cpp
+  modules/gfx.cpp
+  modules/gui.cpp
   modules/palettes.cpp
   pref/preferences.cpp
   recent_files.cpp
@@ -700,8 +579,107 @@ target_sources(app-lib PRIVATE
   tools/velocity.cpp
   transaction.cpp
   transformation.cpp
+  ui/alpha_entry.cpp
+  ui/alpha_slider.cpp
+  ui/app_menuitem.cpp
+  ui/backup_indicator.cpp
+  ui/browser_view.cpp
+  ui/brush_popup.cpp
+  ui/button_set.cpp
+  ui/color_bar.cpp
+  ui/color_button.cpp
+  ui/color_popup.cpp
+  ui/color_selector.cpp
+  ui/color_shades.cpp
+  ui/color_sliders.cpp
+  ui/color_spectrum.cpp
+  ui/color_tint_shade_tone.cpp
+  ui/color_wheel.cpp
+  ui/configure_timeline_popup.cpp
+  ui/context_bar.cpp
+  ui/dithering_selector.cpp
+  ui/doc_view.cpp
+  ui/drop_down_button.cpp
+  ui/dynamics_popup.cpp
+  ui/editor/brush_preview.cpp
+  ui/editor/delayed_mouse_move.cpp
+  ui/editor/dragging_value_state.cpp
+  ui/editor/drawing_state.cpp
+  ui/editor/editor.cpp
+  ui/editor/editor_observers.cpp
+  ui/editor/editor_render.cpp
+  ui/editor/editor_states_history.cpp
+  ui/editor/editor_view.cpp
+  ui/editor/moving_cel_state.cpp
+  ui/editor/moving_pixels_state.cpp
+  ui/editor/moving_selection_state.cpp
+  ui/editor/moving_slice_state.cpp
+  ui/editor/moving_symmetry_state.cpp
+  ui/editor/navigate_state.cpp
+  ui/editor/pivot_helpers.cpp
+  ui/editor/pixels_movement.cpp
+  ui/editor/play_state.cpp
+  ui/editor/scrolling_state.cpp
+  ui/editor/select_box_state.cpp
+  ui/editor/standby_state.cpp
+  ui/editor/state_with_wheel_behavior.cpp
   ui/editor/tool_loop_impl.cpp
+  ui/editor/transform_handles.cpp
+  ui/editor/zooming_state.cpp
+  ui/export_file_window.cpp
+  ui/expr_entry.cpp
+  ui/file_list.cpp
+  ui/file_list_view.cpp
+  ui/file_selector.cpp
+  ui/filename_field.cpp
+  ui/font_popup.cpp
+  ui/hex_color_entry.cpp
+  ui/home_view.cpp
+  ui/icon_button.cpp
+  ui/incompat_file_window.cpp
+  ui/input_chain.cpp
+  ui/keyboard_shortcuts.cpp
   ui/layer_frame_comboboxes.cpp
+  ui/main_menu_bar.cpp
+  ui/main_window.cpp
+  ui/mini_help_button.cpp
+  ui/notifications.cpp
+  ui/optional_alert.cpp
+  ui/palette_popup.cpp
+  ui/palette_view.cpp
+  ui/palettes_listbox.cpp
+  ui/popup_window_pin.cpp
+  ui/pref_widget.cpp
+  ui/preview_editor.cpp
+  ui/recent_listbox.cpp
+  ui/resources_listbox.cpp
+  ui/rgbmap_algorithm_selector.cpp
+  ui/sampling_selector.cpp
+  ui/search_entry.cpp
+  ui/select_accelerator.cpp
+  ui/selection_mode_field.cpp
+  ui/skin/font_data.cpp
+  ui/skin/skin_part.cpp
+  ui/skin/skin_property.cpp
+  ui/skin/skin_slider_property.cpp
+  ui/skin/skin_theme.cpp
+  ui/slice_window.cpp
+  ui/slider2.cpp
+  ui/status_bar.cpp
+  ui/tabs.cpp
+  ui/tag_window.cpp
+  ui/task_widget.cpp
+  ui/tile_button.cpp
+  ui/tileset_selector.cpp
+  ui/timeline/ani_controls.cpp
+  ui/timeline/timeline.cpp
+  ui/toolbar.cpp
+  ui/user_data_view.cpp
+  ui/workspace.cpp
+  ui/workspace_panel.cpp
+  ui/workspace_tabs.cpp
+  ui/zoom_entry.cpp
+  ui_context.cpp
   util/autocrop.cpp
   util/buffer_region.cpp
   util/cel_ops.cpp
@@ -725,6 +703,7 @@ target_sources(app-lib PRIVATE
   util/tile_flags_utils.cpp
   util/tileset_utils.cpp
   util/wrap_point.cpp
+  widget_loader.cpp
   xml_document.cpp
   xml_exception.cpp)
 
@@ -732,6 +711,23 @@ if(TARGET generated_version)
   add_dependencies(app-lib generated_version)
 endif()
 
+if(ENABLE_NEWS)
+  target_compile_definitions(app-lib PUBLIC -DENABLE_NEWS)
+  target_sources(app-lib PRIVATE
+    res/http_loader.cpp
+    ui/news_listbox.cpp)
+endif()
+
+if(ENABLE_DRM)
+  target_link_libraries(app-lib drm-lib)
+  target_compile_definitions(app-lib PUBLIC
+    -DENABLE_DRM
+    -DENABLE_SAVE)
+  target_sources(app-lib PRIVATE
+    ui/enter_license.cpp
+    ui/aseprite_update.cpp)
+endif()
+
 target_link_libraries(app-lib
   laf-base
   cfg-lib