[gtk: 1/2] Correct translation of Mac JIS Eisu & Kana keys

[Emmanuele Bassi <ebassi src gnome org>]

commit bd7b8e87c12cb0fee8a5ccf073e116063e4019ba
Author: gsittyz <gsittyz gmail com>
Date:   Sat Jul 24 15:39:10 2021 +0900

    Correct translation of Mac JIS Eisu & Kana keys
    
    Since UCKeyTranslate() converts these keys to Space key unexpectedly,
    applications can't distinguish these keys by keysyms.
    To solve it, this fix translates these keys by the same way with
    function keys & keypad keys.
    This patch is equivalent to the patch proposed in:
    https://bugzilla.gnome.org/show_bug.cgi?id=702841
    
    Closes #4117

 gdk/macos/gdkmacoskeymap.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
---
diff --git a/gdk/macos/gdkmacoskeymap.c b/gdk/macos/gdkmacoskeymap.c
index 4d54311874..5cf34d3ed3 100644
--- a/gdk/macos/gdkmacoskeymap.c
+++ b/gdk/macos/gdkmacoskeymap.c
@@ -141,6 +141,29 @@ const static struct {
   { 92, GDK_KEY_9, GDK_KEY_KP_9 }
 };
 
+/* Keys only in JIS layout.
+ * The rationale of these key codes is <HIToolbox/Events.h> in Carbon.
+ */
+const static struct {
+  guint keycode;
+  guint keyval;
+} jis_keys[] = {
+#if 0
+  /* Although These keys are also defined in <HIToolbox/Events.h>, they can be
+   * translated by UCKeyTranslate correctly.
+   */
+  { 0x5D, GDK_KEY_yen },
+  { 0x5E, GDK_KEY_underscore },
+  { 0x5F, GDK_KEY_comma },
+#endif
+  /* These keys are unexpectedly translated to Space key by UCKeyTranslate,
+   * and there is no suitable ucs value for them to add to special_ucs_table.
+   * So we should translate them particularly.
+   */
+  { 0x66 /* 102 */, GDK_KEY_Eisu_toggle },
+  { 0x68 /* 104 */, GDK_KEY_Hiragana }
+};
+
 /* These values aren't covered by gdk_unicode_to_keyval */
 const static struct {
   gunichar ucs_value;
@@ -346,6 +369,13 @@ gdk_macos_keymap_update (GdkMacosKeymap *self)
       if (p[0] == known_numeric_keys[i].normal_keyval)
         p[0] = known_numeric_keys[i].keypad_keyval;
     }
+      
+  for (i = 0; i < G_N_ELEMENTS (jis_keys); i++)
+    {
+      p = keyval_array + jis_keys[i].keycode * KEYVALS_PER_KEYCODE;
+      p[0] = jis_keys[i].keyval;
+      p[1] = p[2] = p[3] = 0;
+    }
 
   g_signal_emit_by_name (self, "keys-changed");
 }