Commit 0d4918950e added a new place
(QXcbWindow::setTransparentForMouseEvents()) where requests from the
XFixes extension are generated. However, this wasn't checking if the
extension is actually supported before using it.
Fix this by turning QXcbWindow::setTransparentForMouseEvents() into a
no-op if the XFixes extension isn't available.
This means that the window in question won't be transparent for mouse
events, but we cannot do much about that if the X server doesn't support
the required extension.
Task-number: QTBUG-38109
Change-Id: I2931481eb71bab990f2dcf0ec600b9e62d3d799c
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>