gtk-demo: Track the selection

Use GtkSelectionFilterModel to track and display the
selection. Add some other selection information for
good measure.
9 jobs for selection-filter in 47 minutes and 23 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  .Pre
failed #793129
allowed to fail
style-check-diff

00:06:41

 
  Build
passed #793130
fedora-x86_64

00:09:40

passed #793132
win32-ps
msys2-mingw64

00:06:21

passed #793131
release-build

00:10:56

 
  Analysis
passed #793133
static-scan

00:19:34

 
  Docs
passed #793134
reference

00:10:10

 
  Flatpak
manual #793135
flatpak allowed to fail manual
flatpak-manual:demo
manual #793137
flatpak allowed to fail manual
flatpak-manual:icon-browser
manual #793136
flatpak allowed to fail manual
flatpak-manual:widget-factory
 
Name Stage Failure
failed
style-check-diff .Pre
 GDK_AVAILABLE_IN_ALL
-GtkSelectionModel * gtk_selection_filter_model_get_model (GtkSelectionFilterModel *self);
+GtkSelectionModel *gtk_selection_filter_model_get_model (GtkSelectionFilterModel *self);

G_END_DECLS

Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1