It works now

sesman/chansrv/input_ibus.c

@@ -222,6 +222,8 @@ xrdp_input_unicode_init()
         return 0;
     }
 
+    sleep(5);
+
     LOG(LOG_LEVEL_INFO, "xrdp_ibus_init: Initializing the iBus engine");
     ibus_init();
     bus = ibus_bus_new();

xrdp/xrdp_mm.c

@@ -2159,7 +2159,7 @@ int xrdp_mm_send_unicode_to_chansrv(struct xrdp_mm *self,
     }
     out_uint32_le(s, 0); /* version */
     out_uint32_le(s, 24); /* size */
-    out_uint32_le(s, 21); /* msg id */
+    out_uint32_le(s, 23); /* msg id */
     out_uint32_le(s, 16); /* size */
     out_uint32_le(s, key_down);
     out_uint32_le(s, unicode);
@@ -3034,7 +3034,6 @@ xrdp_mm_chansrv_connect(struct xrdp_mm *self, const char *port)
             "connect successful");
     }
 
-    
     /* if client supports unicode input, initialize the input method */
     if (1)
     {

xrdp/xrdp_wm.c

@@ -1676,14 +1676,64 @@ xrdp_wm_key_sync(struct xrdp_wm *self, int device_flags, int key_flags)
 }
 
 /*****************************************************************************/
-static int
+/**
-xrdp_wm_key_unicode(struct xrdp_wm *self, int device_flags, char32_t unicode)
+ * Takes a stream of UTF-16 characters and  maps then to Unicode characters
+ */
+static char32_t
+get_unicode_character(struct xrdp_wm *self, int device_flags, char16_t c16)
 {
+    char32_t c32 = 0;
+    int *high_ptr;
+
+    if (device_flags & KBD_FLAG_UP)
+    {
+        high_ptr = &self->last_high_surrogate_key_up;
+    }
+    else
+    {
+        high_ptr = &self->last_high_surrogate_key_down;
+    }
+
+    if (IS_HIGH_SURROGATE(c16))
+    {
+        // Record high surrogate for next time
+        *high_ptr = c16;
+    }
+    else if (IS_LOW_SURROGATE(c16))
+    {
+        // If last character was a high surrogate, we can use it
+        if (*high_ptr != 0)
+        {
+            c32 = C32_FROM_SURROGATE_PAIR(c16, *high_ptr);
+            *high_ptr = 0;
+        }
+    }
+    else
+    {
+        // Character maps straight across
+        c32 = c16;
+        *high_ptr = 0;
+    }
+
+    return c32;
+}
+
+/*****************************************************************************/
+static int
+xrdp_wm_key_unicode(struct xrdp_wm *self, int device_flags, char32_t c16)
+{
+    char32_t c32 = get_unicode_character(self, device_flags, c16);
+
+    if (c32 == 0)
+    {
+        return 0;
+    }
+
     int index;
 
     for (index = XR_MIN_KEY_CODE; index < XR_MAX_KEY_CODE; index++)
     {
-        if (unicode == self->keymap.keys_noshift[index].chr)
+        if (c32 == self->keymap.keys_noshift[index].chr)
         {
             xrdp_wm_key(self, device_flags, index - XR_MIN_KEY_CODE);
             return 0;
@@ -1692,7 +1742,7 @@ xrdp_wm_key_unicode(struct xrdp_wm *self, int device_flags, char32_t unicode)
 
     for (index = XR_MIN_KEY_CODE; index < XR_MAX_KEY_CODE; index++)
     {
-        if (unicode == self->keymap.keys_shift[index].chr)
+        if (c32 == self->keymap.keys_shift[index].chr)
         {
             if (device_flags & KBD_FLAG_UP)
             {
@@ -1710,7 +1760,7 @@ xrdp_wm_key_unicode(struct xrdp_wm *self, int device_flags, char32_t unicode)
 
     for (index = XR_MIN_KEY_CODE; index < XR_MAX_KEY_CODE; index++)
     {
-        if (unicode == self->keymap.keys_altgr[index].chr)
+        if (c32 == self->keymap.keys_altgr[index].chr)
         {
             if (device_flags & KBD_FLAG_UP)
             {
@@ -1730,7 +1780,7 @@ xrdp_wm_key_unicode(struct xrdp_wm *self, int device_flags, char32_t unicode)
 
     for (index = XR_MIN_KEY_CODE; index < XR_MAX_KEY_CODE; index++)
     {
-        if (unicode == self->keymap.keys_shiftaltgr[index].chr)
+        if (c32 == self->keymap.keys_shiftaltgr[index].chr)
         {
             if (device_flags & KBD_FLAG_UP)
             {
@@ -1750,8 +1800,13 @@ xrdp_wm_key_unicode(struct xrdp_wm *self, int device_flags, char32_t unicode)
     }
 
 #ifdef XRDP_IBUS
-    // Forward unicode to chansrv to input method like iBus
+    if (self->mm->chan_trans != NULL &&
-    xrdp_mm_send_unicode_to_chansrv(self->mm, !(device_flags & KBD_FLAG_UP), unicode);
+        self->mm->chan_trans->status == TRANS_STATUS_UP)
+    {
+        xrdp_mm_send_unicode_to_chansrv(self->mm,
+                                        !(device_flags & KBD_FLAG_UP), c32);
+        return 0;
+    }
 #endif
 
     return 0;