[LightDM] lightdm --test-mode starts, but cant interact

[Jonathan Railsback]

I am trying to use lightdm test-mode to develop a modified greeter.  However, when I type in "lightdm --test-mode --debug" at the terminal, I get the expected X window with the greeter in it, but I'm unable to interact with it in any way, even when I use CTRL+SHIFT to force the window to grab the keyboard and mouse.  Nothing in the debug info suggests (to me) a reason that the keyboard and mouse input shouldn't work.

I'm using lightdm 1.30.0 on Linux Mint 20.1.  I can provide other relevant info as needed.

Thanks,

jonbitzen

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