TigerVNC don't capture modifier keys set on Logitech Options +

[rudironsonijr]

Describe the bug
TigerVNC don't capture modifier keys set on Logitech Options +

To Reproduce

1. Set keyboard shortcuts to my MX Master 2S thumb button gestures on Logitech Option+;
2. Open TigerVNC in full screen and configured to pass shortcuts to the remote machine;
3. Try to use the mouse gestures, no modifier key is sent, only the last key is received.

Expected behavior
Remote host should receive the modifiers.

Screenshots

Client (please complete the following information):

• OS: MacOS 15
• VNC client: TigerVNC
• VNC client version: 1.14.80
• Client downloaded from: Happens both on client downloaded form TigerVNC and built on my machine

Server (please complete the following information):

• OS: Arch
• VNC server: PiKVM
• VNC server version:
• Server downloaded from:
• Server was started using:

Additional context
Add any other context about the problem here.

[rudironsonijr]

More info:

CGSSetGlobalHotKeyOperatingMode

https://stackoverflow.com/a/58012972/16563876

https://github.com/NUIKit/CGSInternal/tree/master

https://forum.qt.io/topic/49253/capturing-alt-tab-event/5

https://fossies.org/linux/SDL2/src/video/cocoa/SDL_cocoakeyboard.m

https://www.virtualbox.org/svn/vbox/trunk/src/VBox/Frontends/VirtualBox/src/platform/darwin/DarwinKeyboard.cpp

http://git.ithinksw.org/~jspiros/WindowBlur.git/blob/HEAD:/CGSInternal/CGSHotKeys.h

[rudironsonijr]

https://discourse.libsdl.org/t/sdl-cocoa-add-keyboard-grab-support/32323

[rudironsonijr]

https://github.com/libsdl-org/SDL/blob/main/src/video/cocoa/SDL_cocoakeyboard.m

[CendioOssman]

We only respond to keyboard events, so if Logitech is doing something magical, then it might not be compatible.

Could you try enabling debug logging and see if you get any log lines when you use the gestures:

https://github.com/TigerVNC/tigervnc/wiki/Debug-Logs#os-x

It would also be interesting to see how other applications behave. Please try the following page in a browser and use the gestures with the input box focused:

https://dvcs.w3.org/hg/d4e/raw-file/tip/key-event-test.html