Tab drag-and-drop does not create a new window under Wayland (mate-terminal 1.26.x)

[pengjusong63-byte]

Environment

mate-terminal version: 1.26.1

GTK version: 3.24.41

VTE version: 0.74

Desktop environment: MATE Kylin V11

Session type: Wayland

OS: : Kylin Linux V11

Description

When running under Wayland, mate-terminal does not allow dragging a notebook tab out of the window to create a new window.

This feature works correctly under X11, but under Wayland nothing happens — the tab cannot be detached.

Steps to reproduce

Start mate-terminal in a Wayland session

Open multiple tabs

Try to drag one tab out of the window

Expected result

A new mate-terminal window should be created with the dragged tab.

Actual result

Nothing happens.
The tab remains inside the original window.
No visible error message.

Additional notes

GTK 3.24 on Wayland no longer emits create-window / tab-detached signals for GtkNotebook

Other MATE apps such as pluma support Wayland tab detaching via custom drag-and-drop implementation

It seems mate-terminal relies on the old X11-only GtkNotebook behavior

Suggested direction / possible cause

mate-terminal uses the legacy GtkNotebook “detachable” mechanism, which is not supported under Wayland.

Potential fix options:

Implement custom DnD on the tab label (drag-begin, drag-update, drag-end)

Create a new mate-terminal window manually when drag ends outside the window

Follow the implementation used by pluma Notebook DnD

I can provide a minimal working patch or test code if needed.

[lukefromdc]

If you can provide a workabout patch I can easily turn it into a PR for review, and easily test it. Recoding this myself might be more than I can handle in reasonable time.

[pengjusong63-byte]

Hi,

I’ve implemented a minimal working demo for Wayland tab detaching in mate-terminal.

Since GTK 3.24 under Wayland no longer emits create-window or tab-detached signals, this demo uses manual drag detection:

Tracks mouse press, motion, and release events on the notebook.

Detects when a tab is dragged outside the notebook window.

Creates a new GTK window and moves the dragged tab into it.

Here’s the demo code: notebook_tab_detach_wayland.c

[lukefromdc]

This code did not build when I tried to guess at where to put it into mate-terminal. This is not really enough for me to work on on a road trip with limitrd resouces and time.

What I was asking for was a patch or edited file ready for testing.