Linux: clicking the scrollbar up button resizes the window instead of scrolling

What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.911.61220

What subscription do you have?

Free

What platform is your computer?

Linux 7.0.0-31-generic x86_64 x86_64

What issue are you seeing?

n the ChatGPT Linux desktop application, clicking the up button at the top of the vertical scrollbar sometimes causes the application window to be resized instead of scrolling the conversation upward.

The scrollbar control appears to receive an unintended window-resize action rather than performing its normal scrolling action.

https://github.com/user-attachments/assets/39692c7c-148e-446c-92f8-d88b63a6c268

Actual behavior

Clicking the up button causes the ChatGPT window to resize instead of, or while attempting to, scroll upward.

What steps can reproduce the bug?

Open the ChatGPT Linux desktop application.

Open a conversation long enough to display a vertical scrollbar.

Move the pointer to the up button at the top of the scrollbar.

Click it.

Observe that the application window is resized instead of simply scrolling upward.

What is the expected behavior?

Clicking the up button on the vertical scrollbar should scroll the conversation upward.

The window size and position should remain unchanged.

Additional information

The issue occurs with the Linux desktop application version 26.911.61220 running on Linux Mint 22.3 with Cinnamon under X11.

This does not appear to be a Wayland-specific issue, since the affected session is running under X11.

Please let me know if additional diagnostic information or logs would be useful.

Start by reproducing the issue in the Linux desktop application on Linux Mint with Cinnamon under X11, using a conversation long enough to show the scrollbar. Trace the scrollbar up-button interaction and the window-resize behavior. Done means the button scrolls upward without changing the window size or position.