After imshow(), I use several keyboard keys (through waitKey() ) to manipulate the image. In version 4.0.0, the tab key now disables the arrow keys. That is, the arrow keys work fine, put then when I press TAB, the arrow keys stop working.

I noticed that in version 4.0.0, the window that pops up now has a header (with zoom pan buttons) and a footer (with cursor location info).

I suspect that the two issues may be related. Maybe the TAB is getting consumed by the new functionality and it puts the window is a different state? If I can't sort this out, I have a lot of code to rewrite. If that is the culprit, is there anyway I can get rid of the header and footer?

OS:

uname -ra
Linux XPS 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Sample Code:

import cv2
import numpy as np

kp = -1
blank = np.zeros((704,1104,3),np.uint8)
cv2.imshow("Window",blank)

while kp != 27:
   kp = cv2.waitKeyEx(100)
   if kp != -1:
      print (kp)