mjhjmtu

I'm trying to define Suru++ as the cursor theme for LightDM GTK+ greeter on Debian stretch. This is supposedly done by adding Suru++ to the list of alternatives for x-cursor-theme, and choosing it as the alternative:

user@debian:~$ sudo update-alternatives --install /usr/share/icons/default/index.theme x-cursor-theme /usr/share/icons/Suru++/cursor.theme 0
user@debian:~$ sudo update-alternatives --config x-cursor-theme
There are 4 choices for the alternative x-cursor-theme (providing /usr/share/icons/default/index.theme).

 Selection Path Priority Status
------------------------------------------------------------
 0 /etc/X11/cursors/breeze_cursors.theme 102 auto mode
 1 /etc/X11/cursors/Breeze_Snow.theme 41 manual mode
 2 /etc/X11/cursors/breeze_cursors.theme 102 manual mode
 3 /usr/share/icons/Adwaita/cursor.theme 90 manual mode
* 4 /usr/share/icons/Suru++/cursor.theme 0 manual mode

Press <enter> to keep the current choice[*], or type selection number:

If I pick any alternative in that list other than Suru++, the cursor used by LightDM GTK+ greeter is the one from the selected alternative. However, when I pick Suru++ as the alternative in the list, the cursor used by LightDM GTK+ greeter is from the Adwaita theme. This behaviour is weird to me because Suru doesn't inherit anything from Adwaita as far as I can see. In fact the contents of /usr/share/icons/Suru++/cursor.theme are very simple:

[Icon Theme]
Name = Suru
Comment = A Suru-like cursor designed by Sam Hewitt
Inherits = Suru

How should make the LightDM GTK+ greeter use this particular cursor theme?

The problem was that the value of the Inherits option in cursor.theme didn't match the name of the directory containing the theme.

Setting Inherits to Suru++ instead of Suru solved the problem.