Can't set notification borders with `theme.notification_border_width` and `theme.notification_border_color`

[lyh970817]

Output of awesome --version:

awesome v4.3-1588-gb54e50ad6 (Too long) • Compiled against Lua 5.4.4 (running with 0.9.2) • API level: 4 • D-Bus support: yes • xcb-errors support: no • execinfo support: yes • xcb-randr version: 1.6 • LGI version: /usr/share/lua/5.4/lgi/version.lua • Transparency enabled: yes • Custom search paths: no

How to reproduce the issue:

Copy the default theme.lua in /usr/share/awesome/defaults to ~/.config/awesome, and add the following lines after -- Variables set for theming notifications::

theme.notification_border_width = 6
theme.notification_border_color = "#000000"

Modify the beautiful.init(...) line in rc.lua to beautiful.init("~/.config/awesome/theme.lua").

Run notify-send "test" in terminal.

Actual result:

No border appears for the notification window.

Expected result:

The notification window would have a black border.