Steps to reproduce:

1. Press NVDA+n, then t, then s to open speech viewer.
2. Press alt+shift+tab to move to the speech viewer window (it starts as the last window in the alt+tab sequence).
3. Press alt+f4

Actual behavior:

At step 3, nothing happens. Nothing is even recorded to the NVDA log at debug level:

IO - inputCore.InputManager.executeGesture (13:33:05.596) - winInputHook (11520):
Input: kb(desktop):alt+f4
IO - inputCore.InputManager.executeGesture (13:33:08.944) - winInputHook (11520):
Input: kb(desktop):NVDA+f1

(I opened the log viewer a few seconds later)

Expected behavior:

ALT+F4 should close the window, as happens in any other Window (including other NVDA windows).

Note that the speech viewer window can still be closed by pressing alt+n, t, s again, or by using the shortcut key (if you have defined a shortcut key to toggle speech viewer). Creating a shortcut for speech viewer (in NVDA's input gestures dialog) is recommended for users who frequently toggle this feature on and off.

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

2019.3.1

Windows version:

1903 build 18362.388

Name and version of other software in use when reproducing the issue:

Other information about your system:

Other questions

Does the issue still occur after restarting your PC?

Yes. Also reported by a user.

Have you tried any other versions of NVDA? If so, please report their behaviors.

2019.2.1 - alt+f4 closes speech viewer as expected.