macOS: Add native keyboard shortcut for unicode input

Fixes #3407

Author: kovidgoyal

docs/index.rst

@@ -214,7 +214,7 @@ Decrease font size                  :sc:`decrease_font_size` (also :kbd:`⌘+-`
 Restore font size                   :sc:`reset_font_size` (also :kbd:`⌘+0` on macOS)
 Toggle fullscreen                   :sc:`toggle_fullscreen` (also :kbd:`^+⌘+f` on macOS)
 Toggle maximized                    :sc:`toggle_maximized`
-Input unicode character             :sc:`input_unicode_character`
+Input unicode character             :sc:`input_unicode_character` (also :kbd:`^+⌘+space` on macOS)
 Click URL using the keyboard        :sc:`open_url`
 Reset the terminal                  :sc:`reset_terminal`
 Pass current selection to program   :sc:`pass_selection_to_program`

kitty/config_data.py

@@ -1575,6 +1575,8 @@ def macos_option_as_alt(x: str) -> int:
 k('toggle_fullscreen', 'kitty_mod+f11', 'toggle_fullscreen', _('Toggle fullscreen'))
 k('toggle_maximized', 'kitty_mod+f10', 'toggle_maximized', _('Toggle maximized'))
 k('input_unicode_character', 'kitty_mod+u', 'kitten unicode_input', _('Unicode input'))
+if is_macos:
+    k('input_unicode_character', 'cmd+ctrl+space', 'kitten unicode_input', _('Unicode input'), add_to_docs=False)
 k('edit_config_file', 'kitty_mod+f2', 'edit_config_file', _('Edit config file'))
 if is_macos:
     k('edit_config_file', 'cmd+,', 'edit_config_file', _('Edit config file'), add_to_docs=False)