[GTK] Tree does not send SWT.Expand event under certain conditions

[tmssngr]

Describe the bug
In our SWT based application pressing cursor-right on a tree node with children visually expands the child, but does not send an SWT.Expand event, Tree.gtk_test_expand_row is not invoked.

To Reproduce
It can be reproduced by running, e.g., SmartSVN and pressing cursor-right on one of the tree controls with several children.
Unfortunately, I was not able to reproduce with a test snippet. Is there anything that I should debug?

Expected behavior
Before any expansion happens, send the SWT.Expand event.

Environment:

1. Select the platform(s) on which the behavior is seen:

• • All OS
• • Windows
• • Linux
• • macOS

2. Additional OS info (e.g. OS version, Linux Desktop, etc)
   Tried on latest Manjaro Gnome.

[tmssngr]

Shame on me. It was our key listener which interfered.