Tested versions

Reproducible: v4.3.dev5.official [c9c17d6]

System information

Godot v4.3.dev5 - Fedora Linux 39.20240410.1 (Silverblue) - Wayland - Vulkan (Forward+) - dedicated AMD Radeon RX 570 Series (RADV POLARIS10) () - Intel(R) Core(TM) i3-10100F CPU @ 3.60GHz (8 Threads)

Issue description

Headers for lists of signals doesn't get properly updated colors when theme changes:

Steps to reproduce

1. Start editor with any theme (in my case light theme).
2. Pick any node to open it's Node tab.
3. Open editor settings.
4. Change current theme to any other theme (Default in my case).
5. Observe that headers for signals doesn't get properly update their colors making then unreadable.

You can re-open this tab to force colors to update properly, de-select node and then re-select it again to do so (shown in attached video).

Minimal reproduction project (MRP)

Open empty project and select root node.