FileDialog must only pick regular files.

Thanks to Ayla for finding and fixing.

src/filedialog.cpp

@@ -42,3 +42,12 @@ FileDialog::~FileDialog()
 {
 	delete fl;
 }
+
+bool FileDialog::exec() {
+	bool ret = BrowseDialog::exec();
+	if (ret && fl->isDirectory(selected)) {
+		// FileDialog must only pick regular files.
+		ret = false;
+	}
+	return ret;
+}

src/filedialog.h

@@ -33,6 +33,7 @@ public:
 	FileDialog(GMenu2X *gmenu2x, const string &text, const string &filter="",
 		const string &file="", const string &title = "File Dialog");
 	virtual ~FileDialog();
+	bool exec();
 };
 
 #endif /*INPUTDIALOG_H_*/