gtk2 window sometimes missing decorations #3660

Problem description

I use labwc 0.9.4. When I launch the window for a gtk2 application (email client's "Write message" window), first time I launch that window it has decorations. Subsequent times it is lacking decorations. I will attach screenshots.

I like that window to appear at a particular size and position, so I have this in rc.xml:

	<windowRule title="Write:*" ignoreConfigureRequest="yes"><action name="ResizeTo" width="950" height="550" /><action name="MoveTo" x="80" y="100" /></windowRule>

Any ideas what I need to do in order for the window decorations to always appear?

Steps to reproduce

1. Launch Thunderbird (appimage of an old gtk2 version, running in xwayland)
2. Launch a "write message" window. Decorations are present
3. Send email
4. Open a new "write message" window. Decorations are absent

labwc build source

Release

labwc version

0.9.4

labwc environment

Not Applicable

Distribution

Tiny Core Linux