When keyboard input is disabled on a yakuake tab, pressing a key causes the terminal to briefly flash red to remind the user that input is disabled. The red flash doesn't happen with numpad keys. The only numpad key that causes the flash is numlock toggle.
I just found that Ctrl-<letter> key presses don't cause a red flash either. This *might* be a separate issue, but can't really tell without tracking down the cause for both.
Turns out *any* modifier key makes the red flash stop happening. Wonder how I didn't notice that before, especially for Shift. Terminal::eventFilter is explicitly checking for modifiers in the key press event and only emits keyboardInputBlocked if there are no modifiers set. In addition, keys in the numpad have modifiers() == KeypadModifier.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.
I confirm this bug still exists.