Hope you are having a fantastic week. I'll jump straight to the topic.
I'm using xfce-Kali 2020.1b, xfce v4.14.
I wanted to assign 'Super' to xfce4-appfinder in place of whiskermenu because it was way more responsive on my chromebook machine. I was able to bind it and use xfce4-appfinder but was unable to disable whiskermenu's shortcut. So they would launch at the same time or one after the other.
As far as I understand, whiskermenu used to only launch with a keybind to xfce4-popup-whiskermenu that could be set via the Keyboard app's application shortcuts section. But that caused issues with being unable to use 'Super' for any other shortcut because the shortcuts set in "~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml" still get activated on press rather then on release as stated here in the xfce's bug tracker. But I don't have this problem. So my best guess is Super was hard coded to whiskermenu by some party to remedy this bug.
I did a grep search on the entire machine to find where the cfg file for this hardcoded Super is but was unsuccessful. All I found was Ctrl+Esc shortcuts, which cause no harm:
$ sudo grep -ri "xfce4-popup-whiskermenu" /* 2>/dev/null
/etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml: <property name="<Alt>F1" type="string" value="xfce4-popup-whiskermenu --pointer"/>
/etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml: <property name="<Primary>Escape" type="string" value="xfce4-popup-whiskermenu"/>
Binary file /home/thmyris/.mozilla/firefox/gzthh3eo.default-esr/places.sqlite-wal matches
Binary file /home/thmyris/.mozilla/firefox/gzthh3eo.default-esr/places.sqlite matches
/home/thmyris/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml: <property name="<Primary>Escape" type="string" value="xfce4-popup-whiskermenu"/>
/home/thmyris/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml: <property name="<Alt>F1" type="string" value="xfce4-popup-whiskermenu --pointer"/>
There is another post from 6 years ago about this problem's past incarnation here but neither that question nor the answers are of use to this problem sadly.
Super_L key is not hard-coded with Whiskermenu.
Application shortcuts can be accessed in the settings manager. Open Settings Manager > Keyboard > Application Shortcuts
or via xfconf-query in xfce4-keyboard-shortcuts channel
xfconf-query -c xfce4-keyboard-shortcuts -l
In that channel there could be a property that defines Super_L key shortcut
xfconf-query -c xfce4-keyboard-shortcuts -p /commands/custom/Super_L
However, from the output provided...
/home/thmyris/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml: <property name="<Primary>Escape" type="string" value="xfce4-popup-whiskermenu"/>
/home/thmyris/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml: <property name="<Alt>F1" type="string" value="xfce4-popup-whiskermenu --pointer"/
Ctrl + Escape is a key-combo set to popup whisker menu at the panel plugin's button and
Alt + F1 is set to popup whisker menu at the current mouse position
If Super_L stil pops Whisker Menu, most likely there is a daemon running that monitors for Super_L key press and when it is the case, emulates Ctrl+Escape. There are two applications, that I know of, that fit the description: xcape and ksuperkey. One of these could be installed and set to run on startup. Both run as a daemon and both are used to prevent Super key breaking other Super key combinations. If it is xcape, the autostart command is set to run daemon is:
xcape -e 'Super_L=Control_L|Escape'
Xcape is in Debian repos, so it is most likely used. In case of ksuperkey:
ksuperkey -e 'Super_L=Control_L|Escape'
Check which daemon is running and check if there is a autostart entry in the settings:
Settings Manager > Session and Startup > Application Autostart.
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