Won't suspend app "closed" to systray

[haarp]

Hi,

( nice tool! fyi, I just made a Gentoo ebuild for it :) )

xsuspender seems to be working so far. However, I noticed that it won't suspend certain apps that are "closed" but really just "minimize" to the systray. In this case, Signal (Electron-based 🙄)

How it's started: firejail signal-desktop --use-tray-icon

Config:

[Default]
suspend_delay = 5
resume_every = 59
resume_for = 5
send_signals = true
only_on_battery = false
auto_suspend_on_battery = true
downclock_on_battery = 0

[Signal]
match_wm_class_contains = signal
suspend_subtree_pattern = .

When the window loses focus: 👍

(xsuspender:2728894): xsuspender-DEBUG: 14:13:14.697: Suspending window in 5s: 0x4a00003 (1207188): Signal
(xsuspender:2728894): xsuspender-DEBUG: 14:13:19.823: kill -STOP 1207188
(xsuspender:2728894): xsuspender-DEBUG: 14:13:19.824: Exec: pstree 1207188 (.) | kill -STOP
(xsuspender:2728894): xsuspender-DEBUG: 14:13:19.824:       kill -STOP 1207188
(xsuspender:2728894): xsuspender-DEBUG: 14:13:19.845:       kill -STOP 1207191 1207192 1207354 1207433 1499504
(xsuspender:2728894): xsuspender-DEBUG: 14:13:19.863:       kill -STOP 1207347
(xsuspender:2728894): xsuspender-DEBUG: 14:13:19.897:       kill -STOP 1207194

When the window is "closed" to systray: 👎

(xsuspender:2728894): xsuspender-DEBUG: 14:13:56.384: Suspending window in 5s: 0x4a00003 (1207188): Signal
(then...nothing, unsuspended)

Thanks!

edit: Other "closed" windows are affected aswell. Discord, or birdtray'ed Thunderbird. Probably because from xsuspender's perspective, the window simply disappeared?