Option to change Tray Icon color based on System Theme

[YouCanTouCan]

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Brief Summary

I would love if there was an option for the system tray icon to swap between the two monocolor modes depending on the system theme that is being used. When the system theme is dark, the tray icon should be white, and when light, it should be black.

Example

This would be useful for when people regularly change system themes, so that the icon always fits visually like native icons do.

Context

I like having KeepassXC in the system tray, as it allows me to quickly check if its locked or not as well as always summon it to the foreground with ease. It makes it feel native in my system. But, I would also like to be able to change between light and dark mode on my computer with the flick of one switch, without having to manually change settings in every app. Keepassxc has an option to change the theme of the application based on system theme, which is great, but the tray icon does not seem to have a similar option - so after flipping system themes I would need to manually change the setting in KeepassXC, which is annoying, and discourages me having it in the system tray at all. This is, of course, a low priority issue... but it's one I have nonetheless.

[phoerious]

If you have auto-theme on, this should already be the case. On macOS, it's a bit more difficult, because the taskbar doesn't always adhere to the dark/light theme and depends also on things such as your wallpaper.

[YouCanTouCan]

For me on Fedora 42 KDE Plasma Edition, this is not the case, sadly. My apologies, I should have specified OS/DE in my original issue. Below are two screenshots - the first where I set the tray icon to be white and set my global theme to be light, the second where I did the opposite.

[phoerious]

I doubt this is fixable. Unless there's a DBus signal that tells us which colour the panel has, there isn't a way we can use to figure out how the icon should look.

[YouCanTouCan]

Why can the icon color not just change with the system theme in the same way that the KeepassXC theme does? Unless you use third-party widgets (like I did), the color of a KDE panel is only a dark grey or a light grey depending on the system theme - so the monochrome colors KeepassXC provides would work in any reasonable context, it just needs to change between them based on system theme.

[phoerious]

The app UI theme depends on a specific DBus signal and when that isn't there, it falls back to detecting what colour the default Qt/GTK window background widget has. Both are entirely independent of your panel theme. In the KDE settings, you can also configure app and Plasma themes independently.

[YouCanTouCan]

Got it - thank you for the explanation and for bearing with me on this issue. Then yeah, it sounds like this isn't really something that can be fixed at the moment. I'll go back to not having KeePassXC on my system tray - feel free to close this or leave it open depending on how you normally handle currently-unresolvable issues like this