patch 8.0.1026: GTK on-the-spot input has problems

Problem:    GTK on-the-spot input has problems. (Gerd Wachsmuth)
Solution:   Support over-the-spot. (Yukihiro Nakadaira, Ketn Takata, closes
            #1215)
diff --git a/src/misc1.c b/src/misc1.c
index b0589cf..abc455e 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -2730,12 +2730,15 @@
 changed(void)
 {
 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
-    /* The text of the preediting area is inserted, but this doesn't
-     * mean a change of the buffer yet.  That is delayed until the
-     * text is committed. (this means preedit becomes empty) */
-    if (im_is_preediting() && !xim_changed_while_preediting)
-	return;
-    xim_changed_while_preediting = FALSE;
+    if (p_imst == IM_ON_THE_SPOT)
+    {
+	/* The text of the preediting area is inserted, but this doesn't
+	 * mean a change of the buffer yet.  That is delayed until the
+	 * text is committed. (this means preedit becomes empty) */
+	if (im_is_preediting() && !xim_changed_while_preediting)
+	    return;
+	xim_changed_while_preediting = FALSE;
+    }
 #endif
 
     if (!curbuf->b_changed)