First code (#1)

* Create showspaces.plugin

* Create __init__.py

showspaces.plugin

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+[Plugin]
+Loader=python3
+Module=showspaces
+IAge=3
+Name=Show Spaces
+Description=Shows whitespace characters.
+Authors=Marc Volker Dickmann  <[email protected]>
+Copyright=Copyright © 2017 Marc Volker Dickmann
+Website=http://www.devdiary.org

showspaces/__init__.py

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+# -*- coding: utf-8 -*-
+#
+#  Copyright (C) 2017 - Marc Volker Dickmann
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+import gi
+gi.require_version('Gedit', '3.0')
+gi.require_version('Gtk', '3.0')
+from gi.repository import GObject, Gio, GLib, Gtk, GtkSource, Gedit
+
+class ShowSpacesPlugin(GObject.Object, Gedit.ViewActivatable):
+    __gtype_name__ = "ShowSpacesPlugin"
+
+    view = GObject.Property(type=Gedit.View)
+
+    def __init__(self):
+        GObject.Object.__init__(self)
+
+    def do_activate(self):
+        if self.view:
+            self.view.set_draw_spaces(GtkSource.DrawSpacesFlags.SPACE | GtkSource.DrawSpacesFlags.TAB | GtkSource.DrawSpacesFlags.LEADING | GtkSource.DrawSpacesFlags.TRAILING)
+
+    def do_deactivate(self):
+        if self.view:
+            self.view.set_draw_spaces(0)