Define gui_macvim_update

In order to update channels surely in ":sleep"

src/MacVim/gui_macvim.m

@@ -347,12 +347,19 @@ gui_mch_update(void)
 
     CFAbsoluteTime nowTime = CFAbsoluteTimeGetCurrent();
     if (nowTime - lastTime > 1.0 / 30) {
-        [[MMBackend sharedInstance] update];
+        gui_macvim_update();
         lastTime = nowTime;
     }
 }
 
 
+    void
+gui_macvim_update(void)
+{
+    [[MMBackend sharedInstance] update];
+}
+
+
 /* Flush any output to the screen */
     void
 gui_mch_flush(void)

src/proto/gui_macvim.pro

@@ -17,6 +17,8 @@ gui_mch_open(void);
     void
 gui_mch_update(void);
     void
+gui_macvim_update(void);
+    void
 gui_mch_flush(void);
     void
 gui_macvim_flush(void);

src/ui.c

@@ -707,7 +707,14 @@ ui_breakcheck_force(int force)
 
 #ifdef FEAT_GUI
     if (gui.in_use)
+    {
+# ifdef FEAT_GUI_MACVIM
+	if (force)
+	    gui_macvim_update();
+	else
+# endif
 	gui_mch_update();
+    }
     else
 #endif
 	mch_breakcheck(force);