Add support for restoring original font size after zooming. Also import 'err' from terminatorlib

doc/terminator.1

@@ -103,6 +103,15 @@ Swap tab position with next Tab
 .B Ctrl+Shift+PageUp
 Swap tab position with previous Tab
 .TP
+.B Ctrl+Plus (+)
+Increase font size
+.TP
+.B Ctrl+Minus (-)
+Decrease font size
+.TP
+.B Ctrl+Equals (=)
+Restore font size to original setting
+.TP
 .B F11
 Toggle fullscreen
 .SH "Drag and Drop"

terminator

@@ -39,7 +39,7 @@ TARGET_TYPE_VTE = 8
 
 # import our configuration loader
 from terminatorlib import config
-from terminatorlib.config import dbg
+from terminatorlib.config import dbg, err
 
 #import encoding list
 from terminatorlib.encoding import TerminatorEncoding
@@ -611,6 +611,9 @@ text/plain
       elif keyname == 'minus':
         self.zoom (False)
         return (True)
+      elif keyname == 'equal':
+        self.zoom_orig ()
+        return (True)
 
     mask = gtk.gdk.CONTROL_MASK | gtk.gdk.SHIFT_MASK | gtk.gdk.MOD1_MASK
     if (event.state & mask) == mask:
@@ -690,6 +693,9 @@ text/plain
     # if you intend to use it, reinit it
     return (False)
 
+  def zoom_orig (self):
+    self._vte.set_font (pango.FontDescription (self.conf.font))
+
   def zoom (self, zoom_in):
     pangodesc = self._vte.get_font ()
     fontsize = pangodesc.get_size ()