fix: preserve emoji commits through XIM

tests/xim_test.c

@@ -1,8 +1,12 @@
 #include <assert.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <xcb-imdkit/encoding.h>
 #include <xkbcommon/xkbcommon-keysyms.h>
 #include "../xim/keymap.h"
+#include "../xim/ximtext.h"
 
 enum
 {
@@ -11,6 +15,23 @@ enum
 	Group1 = 1<<13,
 };
 
+static void
+checktext(const char *s)
+{
+	char *ct, *utf8;
+	size_t clen, len, ulen;
+
+	len = strlen(s);
+	ct = ximcompound(s, len, &clen);
+	assert(ct != NULL);
+	utf8 = xcb_compound_text_to_utf8(ct, clen, &ulen);
+	assert(utf8 != NULL);
+	assert(ulen == len);
+	assert(memcmp(utf8, s, len) == 0);
+	free(utf8);
+	free(ct);
+}
+
 int
 main(void)
 {
@@ -23,6 +44,8 @@ main(void)
 		XKB_KEY_a, XKB_KEY_A, XKB_KEY_NoSymbol, XKB_KEY_NoSymbol,
 	};
 
+	xcb_compound_text_init();
+
 	assert(keymaplookup(letters, 4, 0) == XKB_KEY_a);
 	assert(keymaplookup(letters, 4, ShiftMask) == XKB_KEY_A);
 	assert(keymaplookup(letters, 4, LockMask) == XKB_KEY_A);
@@ -34,5 +57,9 @@ main(void)
 	assert(keymaplookup(punctuation, 2, LockMask|ShiftMask) == XKB_KEY_exclam);
 	assert(keymaplookup(missing, 4, Group1) == XKB_KEY_a);
 	assert(keymaplookup(NULL, 0, 0) == XKB_KEY_NoSymbol);
+	checktext("한글");
+	checktext("😀");
+	checktext("❤️");
+	checktext("A😀한");
 	return 0;
 }