New tests: GTK3 platform accessibility

[Stephan Bergmann]

On 8/1/23 19:30, Colomban Wendling wrote:
> Linux CIs are running these tests, but anybody willing is encouraged to 
> enable those locally and report any issue (don't hesitate to CC me).

That CppunitTest_vcl_gtk3_a11y appears to be a frequent cause of failure 
now on Jenkins, with the typically failure log containing some

[...]
> found run attribute: MMToPixelRatio=<Any: (float) 1.11111>
>   matching atspi attribute is: mm-to-pixel-ratio=1.11111
> unknown:0:Test1::TestBody
> An uncaught exception of type com.sun.star.uno.RuntimeException
> - timeout from dbind at /home/tdf/lode/jenkins/workspace/lo_tb_master_linux_dbg/vcl/qa/cppunit/a11y/atspi2/atspiwrapper.hxx:302
> 
> warn:sw.core:19780:19780:sw/source/core/attr/calbck.cxx:196: a 16SwTextFormatColl client added as listener to a 16SwTextFormatColl during client iteration.
> warn:sw.core:19780:19780:sw/source/core/attr/calbck.cxx:196: a 16SwLineNumberInfo client added as listener to a 12SwCharFormat during client iteration.
> Test1::TestBody finished in: 153317ms
> ##Failure Location unknown## : Error
> Test name: Test1::TestBody
> An uncaught exception of type com.sun.star.uno.RuntimeException
> - timeout from dbind at /home/tdf/lode/jenkins/workspace/lo_tb_master_linux_dbg/vcl/qa/cppunit/a11y/atspi2/atspiwrapper.hxx:302
> 
> Failures !!!
> Run: 1   Failure total: 1   Failures: 0   Errors: 1
> 
> (cppunittester:19780): GLib-GObject-CRITICAL **: 20:29:18.296: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
> 
> (cppunittester:19780): GLib-GObject-CRITICAL **: 20:29:18.296: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
> 
> (cppunittester:19780): GLib-GObject-CRITICAL **: 20:29:18.296: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[...]

(<https://ci.libreoffice.org//job/lo_tb_master_linux_dbg/44396/>)