You did remove the explanation, but once more, repeat reading leads sometimes to understanding :
The “stealing focus prevention” of Gnome does steal me the focus to my App currently in focus, e.g.: 5 min. ago, opened a html-file via double-click, firefox will be popup in foreground.
With ctrl-f get no “search-Box”, instead the address box of nautilius, the file-manager not visible, will be edit by me, with the given search string.
Which application did steal the focus of firefox, it is the “Gnome 46 stealing focus prevention” mechanism, it does not recognize the focus of the user, it is all ways the visible app.
“Unfortunately the current situation with smart as the default means that we’re not getting most of the benefits of focus stealing prevention. Apps are able to spawn a new window over your current one and grab keyboard focus, because the smart mode just gives the new window focus, …”(refer to given link, explanation of Gnome SW developer)
“Apps are able to spawn a new window over your current one and grab keyboard focus, …”
Yes, of course, a double click on a html-file spawn a new window, over nautilus, my current one, and grab keyboard focus, yes, that is my intention if I open a html-file via doubleclick and search via ctrl-f.
But this will be prevented by the “Gnome 46, stealing focus prevention”, it does mean Gnome prevent the user for normal work, what a mess !
Every one can read it : https_bugs_launchpad_net_ubuntu_+source_gnome-shell_+bug/2084505