copied from https://gist.github.com/raw/626040/be6a04f0e64c56185ba5850415ac59dad4cd62a0/screen-utf8-nfd.patch

screen-utf8-nfd.patch

diff --git a/src/ansi.c b/src/ansi.c
index fa53775..4a21f84 100644
--- a/src/ansi.c
+++ b/src/ansi.c
@@ -725,6 +725,10 @@ register int len;
 		      LPutChar(&curr->w_layer, &omc, ox, oy);
 		      LGotoPos(&curr->w_layer, curr->w_x, curr->w_y);
 		    }
+		  if (curr->w_mbcs)
+		    {
+		      curr->w_rend.mbcs = curr->w_mbcs = 0;
+		    }
 		  break;
 		}
 	      font = curr->w_rend.font;
diff --git a/src/display.c b/src/display.c
index 5fa11cb..2081e7e 100644
--- a/src/display.c
+++ b/src/display.c
@@ -604,7 +604,7 @@ int c;
 	    D_x += D_AM ? 1 : -1;
 	  D_mbcs = 0;
 	}
-      else if (utf8_isdouble(c))
+      else if (utf8_isdouble(c) || (c >= 0xd800 && c < 0xe000))
 	{
 	  D_mbcs = c;
 	  D_x++;