bpo-39852: IDLE 'Go to line' deletes selection, updates status (GH-18801)

It appears standard that moving the text insert cursor away from a selection clears the
selection.  Clearing prevents accidental deletion of a possibly off-screen bit of text.
The update is for Ln and Col on the status bar.

Lib/idlelib/editor.py

@@ -678,8 +678,11 @@ class EditorWindow(object):
         if lineno <= 0:
             text.bell()
             return "break"
-        text.mark_set("insert", "%d.0" % lineno)
+
+        text.tag_remove("sel", "1.0", "end")
+        text.mark_set("insert", f'{lineno}.0')
         text.see("insert")
+        self.set_line_and_column()
         return "break"
 
     def open_module(self):