4.21.8

- gobject-linter: Fix inconsistent_function_signature
- gobject-linter: Fix unnecessary_null_check
- gobject-linter: Fix g_error_leak
- gobject-linter: Fix g_param_spec_static_strings
- gobject-linter: Fix property_switch_exhaustiveness
- gobject-linter: Fix strcmp_explicit_comparison
- gobject-linter: Fix missing_autoptr_cleanup
- gobject-linter: Fix use_g_steal_pointer
- gobject-linter: Fix matching_declare_define
- gobject-linter: Fix use_clear_functions
- Do not compare gboolean to TRUE or FALSE
- cppcheck: Fix memleak
- cppcheck: Fix knownConditionTrueFalse
- cppcheck: Fix redundantInitialization
- cppcheck: Fix unknownMacro
- gcc-analyzer: Update false positive file after gcc version bump
- cppcheck: Fix varFuncNullUB
- cppcheck: Fix unusedStructMember
- cppcheck: Fix unreadVariable
- cppcheck: Fix invalidPrintfArgType_sint
- cppcheck: Fix nullPointer
- cppcheck: Fix nullPointerRedundantCheck
- cppcheck: Fix knownConditionTrueFalse
- cppcheck: Fix unknownMacro
- scan-build: Update false positive file after clang version bump
- die-editor: Improve Info for unknown icons (#145)
- Add missing chain up to parent class
- die-editor: show icon name in the tooltip (#145)
- shortcuts: Replace Ctrl+Alt+{D,L} with Super+{D,L}
- I18n: Update po/LINGUAS list
- Expose method 'xfce_icon_view_get_cell_area'
- docs: Add missing symbol
- build: Do not display full path in generated headers
- Wording "file name" --> "filename" (#142)
- Downgrade the "no startup notification on Wayland" warning to message
- Translation Updates:
  Albanian, Arabic, Asturian, Azerbaijani, Basque, Belarusian,
  Bulgarian, Catalan, Chinese (China), Chinese (Hong Kong), Chinese
  (Taiwan), Czech, Danish, Dutch, Eastern Armenian, English (United
  Kingdom), Esperanto, Estonian, Finnish, French, Galician, Georgian,
  German, Greek, Hebrew, Hungarian, Indonesian, Interlingue, Italian,
  Japanese, Kazakh, Korean, Lao, Lithuanian, Norwegian Bokmål, Occitan
  (post 1500), Persian (Iran), Polish, Portuguese, Portuguese (Brazil),
  Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish,
  Thai, Turkish, Ukrainian, Uyghur, Venetian, Vietnamese, Welsh