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On Win 10, Python 3.5 or 3.6, IDLE Shell or Editor with at least a few lines of text: hit Alt-G to open 'Goto' window. Enter a line # other than the current one. Hit <Return>. Cursor moves to line enter, though it shrinks to one pixel wide from two pixels. Line:col in status bar is updated.
Instead of hitting return, click [OK] button. Same thing happens except that status bar line:col is NOT updated. Here is relevant code in EditorWindow, about line 610
 def goto_line_event(self, event):
 text = self.text
 lineno = tkSimpleDialog.askinteger("Goto",
 "Go to line number:",parent=text)
 text.mark_set("insert", "%d.0" % lineno)
 text.see("insert")
Changing parent=text to parent=self.root makes no difference. I have not yet tried simulating the interaction with button.invoke and event_generate('<Key-Return>.
My guess is that one of the last two tk methods is supposed to generate a cursor moved event that is bound to a reset status bar function. But somehow the previous click instead of keypress inhibits the event. So this seems a tk bug. Sethiy, what do you think?
The workaround for IDLE is to manually invoke a status bar update.