Yes it does, for instance I use it in Firefox all the time without it shutting the program down. Also tried to press ctrl+a in various other programs with no effect. It's just keepass that have this behaviour.
Just switched to Fedora from Windows and installed KeePass from the Gnome app store. When I search in KeePass I always clear the field by pressing ctrl+a and then start to type. This worked fine in Windows but on Fedora pressing ctrl+a causes KeePass to shut down. Pressing ctrl+a in other programs does not cause the program to shut down. Has anyone else had this problem? Is this a setting I need to change in KeePass to stop it from shutting down when I just want to highlight all text in the search...