nbstart does not fail nicely on unsupported gui

[Xavier de Gaye]

The :nbstart command does not print an error message and attempts to
connect the netbeans socket when vim is built with a gui that is not
supported by netbeans.

The attached patch fixes this bug.


Xavier

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diff --git a/src/netbeans.c b/src/netbeans.c
--- a/src/netbeans.c
+++ b/src/netbeans.c
@@ -2773,6 +2773,16 @@
 ex_nbstart(eap)
     exarg_T	*eap;
 {
+#ifdef FEAT_GUI
+# if !defined(FEAT_GUI_MOTIF) && !defined(FEAT_GUI_GTK)  \
+                && !defined(FEAT_GUI_W32)
+    if (gui.in_use)
+    {
+        EMSG(_("E511: netbeans is not supported with this GUI"));
+        return;
+    }
+# endif
+#endif
     netbeans_open((char *)eap->arg, FALSE);
 }