updated for version 7.3.782
Problem:    Windows: IME composition may use a wrong font.
Solution:   Use 'guifontwide' for IME when it is set. (Taro Muraoka)
diff --git a/src/gui_w48.c b/src/gui_w48.c
index 1d380fb..0a7f367 100644
--- a/src/gui_w48.c
+++ b/src/gui_w48.c
@@ -323,10 +323,15 @@
 
 /*
  * For control IME.
+ *
+ * These LOGFONT used for IME.
  */
 #ifdef FEAT_MBYTE
 # ifdef USE_IM_CONTROL
+/* holds LOGFONT for 'guifontwide' if available, otherwise 'guifont' */
 static LOGFONT norm_logfont;
+/* holds LOGFONT for 'guifont' always. */
+static LOGFONT sub_logfont;
 # endif
 #endif
 
@@ -3090,6 +3095,39 @@
     return res;
 }
 
+
+#ifdef FEAT_MBYTE_IME
+/*
+ * Set correct LOGFONT to IME.  Use 'guifontwide' if available, otherwise use
+ * 'guifont'
+ */
+    static void
+update_im_font()
+{
+    LOGFONT	lf_wide;
+
+    if (p_guifontwide != NULL && *p_guifontwide != NUL
+	    && get_logfont(&lf_wide, p_guifontwide, NULL, TRUE) == OK)
+	norm_logfont = lf_wide;
+    else
+	norm_logfont = sub_logfont;
+    im_set_font(&norm_logfont);
+}
+#endif
+
+#ifdef FEAT_MBYTE
+/*
+ * Handler of gui.wide_font (p_guifontwide) changed notification.
+ */
+    void
+gui_mch_wide_font_changed()
+{
+# ifdef FEAT_MBYTE_IME
+    update_im_font();
+# endif
+}
+#endif
+
 /*
  * Initialise vim to use the font with the given name.
  * Return FAIL if the font could not be loaded, OK otherwise.
@@ -3112,9 +3150,10 @@
 	font_name = lf.lfFaceName;
 #if defined(FEAT_MBYTE_IME) || defined(GLOBAL_IME)
     norm_logfont = lf;
+    sub_logfont = lf;
 #endif
 #ifdef FEAT_MBYTE_IME
-    im_set_font(&lf);
+    update_im_font();
 #endif
     gui_mch_free_font(gui.norm_font);
     gui.norm_font = font;