Window mouse_entered signal only emits after the mouse enters and exits once the window

[mrcdk]

Tested versions

• Reproducible in: v4.3.dev3.official [36e943b], v4.2.1.stable.arch_linux

System information

Godot v4.2.1.stable unknown - Manjaro Linux #1 SMP PREEMPT_DYNAMIC Sat Feb 10 09:40:02 UTC 2024 - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Laptop GPU () - AMD Ryzen 9 5900HX with Radeon Graphics (16 Threads)

Issue description

Window mouse_entered signal only emits after the mouse has entered and exited the window viewport at least once.

screen-2024-02-28_05.58.05.mp4

It also happens with non-embedded windows:

screen-2024-02-28_06.04.06.mp4

Steps to reproduce

• Connect to the Window mouse_entered signal.
• Launch the scene and move the mouse into the window
• Notice that the signal has not been emitted
• Leave the window and go back inside
• The signal emits

Minimal reproduction project (MRP)

bug_window_mouse_entered.zip

[Sauermann]

Bisected to #80334