Fade out not working on qt applications in KDE plasma

[Inu90]

Platform

Arch Linux x64
AMD Vega 8 (integrated from a Ryzen 5 3550H laptop apu) latest stable mesa
glxinfo -B, picom --diagnostics and config file

Environment

KDE plasma 5.26

picom version

9.1 according to pacman, vgit-7e568 according to --version

Details

As per the title Dolphin, qbittorrent, Clementine, etc. dont fade out, on the other hand GTK apps (firefox, thunderbird, GIMP) are working as intended.
Also, using xdg-portal's filepicker/save dialog on firefox and that one also doesn't fade out.
Also steam, whatever framework that is using, doesn't fade out.
Fade in works correctly for all apps.

edit:
Only now realized that only fade out on close is broken, fade out on minimize works for everything -except- qbittorrent, since I have it set to minimize to notification area.

[Inu90]

So after a second of clarity I realized the futility of reporting this on stable. Tried git version and still happens, same symptoms.

picom --version
vgit-8a373

[TotallyEz]

Facing a similar issue ,wherein windows does fade out on destroy/migration to different workspaces ,according to a raised github issue it is a bug,hoping it gets fixed in the next patch as it is a bit off putting. for context im running i3-gaps and im using nvidia drivers with the glx backend but i doubt that has to do anything with it

[yshui]

@Inu90 did you disable fade out on close?

[Inu90]

@yshui No, like I said this only happens with qt apps, GTK apps fade out correctly.
Updated earlier today to vgit-9d7cb

[yshui]

@Inu90 can you upload your config file please.

[Inu90]

### Fading
fading = true;
fade-in-step = 0.05;
fade-out-step = 0.05;
fade-delta = 17;
fade-exclude = [
        "class_g = 'yakuake'"
]

### Opacity
opacity-rule = [
        "96:class_g = 'plasmashell'"
];



### Shadows
shadow = true;
shadow-exclude = [
        "class_g = 'yakuake'",
        "class_g = 'lattedock'",
        "_GTK_FRAME_EXTENTS@:c",
        "QTILE_INTERNAL@:c",
        "name = 'cpt_frame_xcb_window'",
        "class_g ?= 'zoom'",
        "_NET_WM_STATE@:32a *= '_NET_WM_STATE_HIDDEN'",
        "_NET_WM_OPAQUE_REGION@:c",
        "class_g = 'TelegramDesktop' && argb",
#       "class_g = 'firefox' && argb",
        "class_g = 'firefox' && window_type = 'popup_menu'",
        "class_g = 'firefox' && window_type = 'utility'",
        "class_g = 'firefox' && window_type = 'tooltip'",
]
xinerama-shadow-crop = true;

### Blur
blur:{
        method = "dual_kawase";
        strength = 7;
#       background = false;
#       background-frame = true;
#       background-fixed = true;
        kern = "3x3box";
}


blur-background-exclude = [
#       "window_type = 'desktop'",
        "_GTK_FRAME_EXTENTS@:c",
        "class_g ?= 'zoom'",
#       "class_g = 'firefox' && argb",
        "class_g = 'firefox' && window_type = 'popup_menu'",
        "class_g = 'firefox' && window_type = 'utility'",
];


### Wintypes
wintypes:{
#       normal = { blur-background = true; };
        splash = { blur-background = false; };
#       popup_menu = { opacity = 0.8; shadow = false; full-shadow = false; };
#       dropdown_menu = { opacity = 0.8; shadow = false; };
        dock = { shadow = false; clip-shadow-above = true; };
        tooltip = { fade = true; shadow = true; opacity = 0.9; focus = true; full-shadow = false; };
        menu = { blur-background = false; };
};

### Backend
backend = "glx";
#backend = "xrender";
vsync = false;

glx-no-stencil = true;
glx-no-rebind-pixmap = false;
xrender-sync-fence = true;
unredir-if-possible = true;

dbus=true;

### Corners
detect-rounded-corners = true;
corner-radius = 5;
rounded-corners-exclude = [
        "class_g = 'yakuake'",
        "window_type = 'dock'",
        "window_type = 'desktop'",
#       "window_type = 'popup_menu'",
        "window_type = 'tooltip'",
];

round-borders = 9;

detect-client-opacity = true;
detect-transient = true;
detect-client-leader = true;

mark-wmwin-focused = true;
mark-ovredir-focused = true;
use-ewmh-active-win = true;

[absolutelynothelix]

can't reproduce in xfce with qbittorrent. kde-specific? but someone reported it to happen in i3 as well...

edit 1: noticed the edit:

Only now realized that only fade out on close is broken

do we even have fade out on close? i don't see it on anything at all, even on xfce4-terminal.

edit 2:
looks like fading on close is broken on glx backend, since it works on xrender one. and i suspect the issue is about this, not about something kde-specific.

[absolutelynothelix]

@yshui, bisecting led me to commit dfe4a36, after it was introduced fading out on close stopped working on glx backend

edit 1: however, reverting it in the current next branch doesn't fix the issue.
edit 2: looks like it's related to commits dfe4a36 and ae62269, i assume fixing #394 mentioned in the second commit broke fading out on close on glx backend.

[yshui]

Potentially a duplicate of #704. Can someone test with the latest next branch?