Use set_buffer instead of instantiation parameter of TextView

GTK+-3 does not support instantiation with parameter.

issue6753
review43481002

tryton/common/htmltextbuffer.py

@@ -416,7 +416,8 @@ if __name__ == '__main__':
     win.add(vbox)
 
     text_buffer = gtk.TextBuffer()
-    text_view = gtk.TextView(text_buffer)
+    text_view = gtk.TextView()
+    text_view.set_buffer(text_buffer)
     vbox.pack_start(text_view)
 
     setup_tags(text_buffer)

tryton/gui/window/view_form/view/form_gtk/textbox.py

@@ -44,7 +44,8 @@ class TextBox(Widget, TranslateMixin):
     def _get_textview(self):
         if self.attrs.get('size'):
             textbuffer = TextBufferLimitSize(int(self.attrs['size']))
-            textview = gtk.TextView(textbuffer)
+            textview = gtk.TextView()
+            textview.set_buffer(textbuffer)
         else:
             textview = gtk.TextView()
         textview.set_wrap_mode(gtk.WRAP_WORD)