Add a workaround for GTK 4 shadows

[SkyyySi]

The currently included workaround for GTK 3 does not appear to work for GTK 4 based applications.

shadow-exclude = [
  "_GTK_FRAME_EXTENTS@:c"
];

This will hide tell picom not to draw shadows for GTK 3 shadows (which would otherwise be seen as a part of the window). It would be great if there were a way to activate the same for GTK 4.

[mpnordland]

Hi @SkyyySi,
I was looking into this issue as well and I found a Reddit post with a solution:
https://www.reddit.com/r/linux/comments/r91aqy/libawaita_makes_programs_look_terrible/hnapp2r/

Basically just add "override_redirect = true" to your shadow-exclude.

[diogofd8]

@mpnordland
How did you fix the issue? I added "override_redirect = true" too the picom.conf but to no avail.
Then I tried putting the line inside "shadow-exclude" but couldn't find a way to make it accept the syntax. The reddit comment doesn't give away a solution unfortunately.

[vladvasiliu]

This worked for me:

shadow-exclude = [
    <bunch-of-rules>,
    "override_redirect = true",
];

[jEsuSdA]

@vladvasiliu

Thanks a lot!

This solves my issue too:
#806

Thanks!

---

EDIT: Sorry! I just noticed this workaround disables ALL dropdown and menu shadows.
I think this is not the solution. :S

[andregalastri]

I had a similar problem with the context menu of some GTK "Save as..." windows. I don't know if it would work for you, but here it is.

This was the issue I was facing:

I solved it by including the following command in picom.conf

shadow-exclude = [
    <your-rules>,
    "class_g = 'xdg-desktop-portal-gnome' && window_type = 'menu'",
];

This will remove only shadows from the context menu. If you want to remove all shadows, just remove the && window_type = 'menu' part, like this

shadow-exclude = [
    <your-rules>,
    "class_g = 'xdg-desktop-portal-gnome'",
];

Hope it helps

[Flashwalker]

Hi @SkyyySi, I was looking into this issue as well and I found a Reddit post with a solution: https://www.reddit.com/r/linux/comments/r91aqy/libawaita_makes_programs_look_terrible/hnapp2r/

Basically just add "override_redirect = true" to your shadow-exclude.

It disables more then needed.

[Flashwalker]

i'm using this (related to GTK4 xdg-portal dialog and Firefox menus):

shadow-exclude = [
  ,"class_g ~= 'xdg-desktop-portal' && _NET_FRAME_EXTENTS@:c && window_type = 'dialog'"
  ,"class_g ~= 'xdg-desktop-portal' && window_type = 'menu'"
   "_NET_FRAME_EXTENTS@:c && WM_WINDOW_ROLE@:s = 'Popup'"
  ,"class_i = 'Firefox' && window_type = 'utility'"
  ,"class_i = 'Firefox' && window_type = 'popup_menu'"
];
blur-background-exclude = [
  ,"class_g ~= 'xdg-desktop-portal' && _NET_FRAME_EXTENTS@:c && window_type = 'dialog'"
  ,"class_g ~= 'xdg-desktop-portal' && window_type = 'menu'"
  ,"_NET_FRAME_EXTENTS@:c && WM_WINDOW_ROLE@:s = 'Popup'"
  ,"class_i = 'Firefox' && window_type = 'utility'"
  ,"class_i = 'Firefox' && window_type = 'popup_menu'"
];

[mgher668]

I solved this by adding menu rule to wintypes for menus/popovers in picom.conf file.

wintypes:
{
  menu = { shadow = false; blur-background = false; };
};

[nestor-andreu]

I'd like to point out that this issue still persists. The idea is not to remove shadows or blur on all menus, but just for gtk popovers (not for Qt's, for example). Ideally, a workaround should fix all of gtk4 menus and popovers, not just a specific application (such as using "class_g ~= 'xdg-desktop-portal'...). I haven't been able to pinpoint the window properties of popovers, as xprop does not work when trying to click on one (for example, executing sleep 5 && xprop, then immediately opening a popover, xprop exits with a message xprop: error: Can't grab the mouse). So no luck yet, it seems. I'm on Manjaro (Arch derivative) and xprop --version outputs vgit-89c2c (and package version is 1.2.7-1). No luck so far. Has there been any step towards a solution or workaround? Thanks!

[Flashwalker]

I don't think this will be fixed by the picom developers as well as the gtk developers.

[starquake]

I found another workaround that seemed to work: (I don't know if there are any unwanted side-effects)

• Add "argb && (override_redirect || wmwin)", to blur-background-exclude and shadow-exclude source

As described in the source above a way to use xprop is to start it, then focus the window using the keyboard, and opening the menu with the keyboard.

EDIT: Seems blur is missing from my semi-transparent terminal windows. Another try: "name = '' && argb && (override_redirect || wmwin)"