Force flush output queue before presenting any dialog

The previous commit did not ensure the output queue was flushed before
"browse" dialogs were shown.

src/MacVim/gui_macvim.m

@@ -1286,6 +1286,9 @@ gui_mch_browse(
     //NSLog(@"gui_mch_browse(saving=%d, title=%s, dflt=%s, ext=%s, initdir=%s,"
     //        " filter=%s", saving, title, dflt, ext, initdir, filter);
 
+    // Ensure no data is on the output queue before presenting the dialog.
+    gui_macvim_force_flush();
+
 #ifdef FEAT_MBYTE
     title = CONVERT_TO_UTF8(title);
     initdir = CONVERT_TO_UTF8(initdir);
@@ -1319,6 +1322,9 @@ gui_mch_dialog(
     //        "dfltbutton=%d textfield=%s)", type, title, message, buttons,
     //        dfltbutton, textfield);
 
+    // Ensure no data is on the output queue before presenting the dialog.
+    gui_macvim_force_flush();
+
 #ifdef FEAT_MBYTE
     title = CONVERT_TO_UTF8(title);
     message = CONVERT_TO_UTF8(message);

src/message.c

@@ -3288,11 +3288,6 @@ do_dialog(type, title, message, buttons, dfltbutton, textfield)
     /* When GUI is running and 'c' not in 'guioptions', use the GUI dialog */
     if (gui.in_use && vim_strchr(p_go, GO_CONDIALOG) == NULL)
     {
-# ifdef FEAT_GUI_MACVIM
-	/* The 'swap file exists' dialog also displays text in the editor
-	 * window so make sure this is flushed before showing the dialog. */
-	gui_macvim_force_flush();
-# endif
 	c = gui_mch_dialog(type, title, message, buttons, dfltbutton,
 								   textfield);
 	msg_end_prompt();