I couldn't find a NET::State that shows a window is invisible because the desktop is shown (NET::Hidden isn't set in this case, at least not with KWin).

Therefore, probably, this will be possible only if we all agree that panels that are hidden on overlapping should be shown when the desktop is shown — even when they're overlapped by a pcmanfm-qt's window (which is possible under KWin, because of a bug in it).

FYI: I tested this with xfwm4 - panel shows up here regularly.

FYI: I tested this with xfwm4 - panel shows up here regularly.

also xfwm4 here, panel stays hidden

I see:

• in lxqt-globalkeys is Shift+Alt+D set and not working at all
• in xfwm4 is Alt+D set and works
• and there is this bug I forgot about: panel shortcut for hiding desktop doesn't work without the "show desktop plugin" added. Globalkeys shortcut "Show Desktop" works only if show-desktop-plugin is added #1690

But testing again with Alt+D in globalkeys and "show desktop plugin" added panel shows up here.

Tested here again and it's working without the patch with both shortcuts. No idea why it didn't work before...

Tested in VM Lubuntu 21.04 and LXQt 1.0. with openbox and --- it doesn't work...
Now the VM broke, so I cannot test with xfwm4

Here 2 panel setup, bottom and right.

Tested here again and it's working without the patch with both shortcuts. No idea why it didn't work before...

Each WM has its own way (its own X11 code) for "Showing Desktop". With KWin, the panel state doesn't change because the overlapping state doesn't change. With compiz-reloaded, the panel is always shown on showing desktop.

So I looked again in Lubuntu with LXQt 0.17 and the showdesktop shortkey works fine with xfwm4 but not with openbox, neither the LXQt one neither the one from openbox, as in this issue report described.

Today on Void linux - Lxqt 1.0 & openbox:
(Ctrl+Alt+D does nothing & Super+D toggle show the desktop but not the panel). A screen with configs:

This is what I saw too - panel doesn't show up with openbox, but does with xfwm4.
If you change to Alt+d in globalkeys? Will it at least work to show the desktop?

Shortcut conflicts aside, there should be the show-desktop widget on the panel for it to work.

Shortcut conflicts aside, there should be the show-desktop widget on the panel for it to work.

Thanks @tsujan for the hint, but even if the show-desktop widget is active on the panel, when the show-desktop keys are pressed the panel remain hidden when "hide only on overlapping window" is on, this is what this issue is about.

Partially true: panel is a key component in lxqt desktop manager, true, but a show-desktop global key functionality must not be compromised by adding or not a widget on it, beside that all required libs are installed, so the global key must remain functional no matter what, my point of view.

@stefonarch someone seems to raise it like an issue: #1690 recently
Edit: it was you :D, didn't noticed until now, sorry