polybar: Tray doesn't use icon color from gtk theme

Describe the issue

I using dark background on polybar, and dark gtk-3 theme that sets all symbolic icons color to white. Also i using icon theme with light symbolic icons by default, but as fallback (if needed icon not found) it using “hicolor” icon theme with default dark icons. On polybar tray i see all that icons in they default color.

Expected behavior:

I expected that polybar will take into account gtk theme and change icons color according to it. For example gnome and cinnamon are doing that for they own status bars. Really it’s not so important to polybar get color from gtk-3 theme (but it will be perfect variant), i just need a way to change icon color.

Actual behavior:

Polybar just don’t changing color for symbolic icons in tray. So icons that my main theme includes are white, other icons are black.

To Reproduce

It happens even with default polybar config. No matter what background or foreground color i set or what is my current gtk-3 theme.

Polybar Log

I removed all custom scripts and leaved only basic modules, and got this log on start:

polybar|warn:  pulseaudio: using default sink alsa_output.pci-0000_00_05.0.iec958-stereo
polybar|error: tray: Failed to put tray above 0x1000001 in the stack (XCB_MATCH (8))

Second error appears only when i (re)start i3 with polybar.

Screenshots

Environment:

• WM: I3
• Distro: Linux mint 20
• Output of polybar -vvv:

polybar 3.4.3

Features: +alsa +curl +i3 +mpd +network(libnl) +pulseaudio +xkeyboard

X extensions: +randr (+monitors) +composite +xkb +xrm +xcursor

Build type: None
Compiler: /usr/bin/c++
Compiler flags: -g -O2 -fdebug-prefix-map=/build/polybar-udaYph/polybar-3.4.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Wpedantic 
Linker flags: -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now