Mouse detection of entering and exiting viewport is inconsistent in Godot 4.2 and different from 4.1

[JanisMancevics]

Tested versions

• Reproducible in v4.2.stable.official.46dc27791
• Behavior is different (and arguably worse than in) 4.1, cross referencing issue from 4.1: https://github.com/godotengine/godot/issues/83442

System information

Fedora Linux 38 - Godot Engine v4.2.stable.official.46dc27791 - Vulkan (Forward+) - AMD Radeon RX 6950 XT (RADV NAVI21)

Issue description

Please check the attached reproduction project and link to the video.

In the cross referenced issue: https://github.com/godotengine/godot/issues/83442 you can compare the behavior with Godot 4.1.

In Godot 4.2:

• The results are different on different operating systems Windows, Mac, Linux (The video shows the behavior on Linux). -- On Windows the behavior was correct with Godot 4.1, now it's almost correct on 4.2, there is a single wrong print right after application starts, then it behaves as expected both when the window is in focus or not. -- On Mac I don't have the results from 4.2, but on 4.1 when application is deactivated, nothing is detected. -- Finally on Linux (check the video): --- If mouse moves in and out viewport and the subviewport while window is active, then the behavior is almost correct, but multiple viewport out messages are printed. --- If the window is deactivated, then no subviewport messages appear, and viewport only print OUT. --- And what's more the prints are inconsistent, when viewport is entered, then sometimes nothing is printed, sometimes OUT is printed, when viewport is exited with the mouse, then usually two OUT messages are printed, but sometimes one.

Steps to reproduce

• Launch the attached reproduction project.

• Make sure the game window is active

• Move your mouse pointer in and out the game window

• Observe the Log console.

• Then after make sure the game window is not in focus anymore

• Move your mouse pointer in and out the game window

• Observer the Log console.

Check video for more details: https://youtu.be/JSXpDo2pJrc

Minimal reproduction project (MRP)

ControlNodeWindowFocusBugReport-42.zip

[akien-mga]

CC @Sauermann @RandomShaper @kitbdev

[Sauermann]

I have tested the MRP on Debian Linux X11 Xfce and I can't replicate the problem with v4.2.stable.official [46dc27791]. For me, the "Viewport OUT" is printed only once when moving the mouse out of the window. I have tested both cases: focused and unfocused game-window. Can you please provide more details: Are you using X11 or Wayland? Which windowmanager are you using?

[JanisMancevics]

Processors: 48 x AMD Ryzen Threadripper 3960X 24-Core Processor Memory: 62.7 GiB of RAM Graphics Processor: AMD Radeon RX 6950 XT Manufacturer: Micro-Star International Co., Ltd. Product Name: MS-7C59 System Version: 1.0

Fedora Linux 39 KDE Plasma Version: 5.27.10 KDE Frameworks Version: 5.113.0 Qt Version: 5.15.11 Kernel Version: 6.6.12-200.fc39.x86_64 (64-bit)

Kwin window manager (the default KDE Plasma window manager)

Graphics Platform: X11

Godot 4.2.1 stable

Window in focus

1. Mouse moves in OS window area

   1. The first time mouse moves in, only \"Control IN\" is printed

   2. After that moving mouse in and out prints correctly \"Control IN\" \"Viewport IN\"

2. Mouse moves out OS window area

   1. The first time mouse moves out, both \"Control OUT\" \"Viewport OUT\" are printed

   2. After that moving mouse in and out prints correctly \"Control OUT\" \"Viewport OUT\"

Window not in focus

1. Mouse moves in OS window area

   1. The first time nothing is printed

   2. After that nothing is printed

2. Mouse moves out OS window area

   1. The first time only \"Viewport OUT\" is printed

   2. After that \"Viewport OUT\" is printed each time mouse move out.

Godot 4.2 stable

Behaves the same way as 4.2.1 stable

Graphics Platform: Wayland

Godot 4.2.1 stable

Window in focus

1. Mouse moves in OS window area

   1. The first time mouse moves in, \"Viewport OUT\" \"Viewport IN\" \"Control IN\" is printed in this order, but sometimes only \"Control IN\" is printed.

   2. After that \"Viewport IN\" \"Control IN\" is printed

2. Mouse moves out OS window area

   1. The first time mouse moves out, \"Control OUT\" \"Viewport OUT\" is printed. But sometimes \"Control OUT\" \"Viewport OUT\" \"Viewport OUT\" is printed.

   2. After that usually \"Control OUT\" \"Viewport OUT\" \"Viewport OUT\" is printed, but sometimes correctly \"Control OUT\" \"Viewport OUT\" is printed.

Window not in focus

1. Mouse moves in OS window area

   1. The first time nothing is printed

   2. After that mostly nothing is printed, but sometimes \"Viewport OUT\" is printed.

2. Mouse moves out OS window area

   1. The first time \"Viewport OUT\" \"Viewport OUT\" is printed.

   2. After that \"Viewport OUT\" \"Viewport OUT\" is printed.

Godot 4.2 stable

Perhaps I just didn\'t have large enough research sample size to see that it behaves like 4.2.1 stable, but there seem to be a few differences.

Window in focus

1. Mouse moves in OS window area

   1. The first time mouse moves in, the same as 4.2.1 stable (just encountered the only \"Control IN\" more frequently)

   2. After that the same as 4.2.1

2. Mouse moves out OS window area

   1. The first time mouse moves out, the same as 4.2.1

   2. After that usually \"Control OUT\" \"Viewport OUT\" \"Viewport OUT\" is printed, never saw the correct \"Control OUT\" \"Viewport OUT\" is printed.

Window not in focus

1. Mouse moves in OS window area

   1. The first time nothing is printed

   2. After that nothing is printed

2. Mouse moves out OS window area

   1. The first time single \"Viewport OUT\" is printed.

   2. After that single \"Viewport OUT\" is printed.

---

I also installed an old and mature X11 window manager \"IceWM\", and the Godot application behaved the same as with Kwin on X11.