Comment 4 for bug 1757381

> tags is commonly separated by a space (like in launchpad, quicken and many other)

No, it is commonly separated with a comma or so. Well… actually it should not matter how it is separated, because that is the point: The user should not need to know this, it should just change the display, as in GitLab e.g.: https://hostux.pics/images/2019/02/03/imagefdf1b36daa77288b.png (there it is a search, but it's the UI I mean)

I have no knowledge about GTK, I only found this (https://developer.gnome.org/gtk3/stable/GtkTextTag.html; somewhat explained in https://developer.gnome.org/gtk3/stable/TextWidget.html), but I doubt this is really what we want…

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That said, maybe the real solution would be to not have a text field, have a "+" button, and that button would then provide the user a (searchable) list of tags (in a popup or so), where they can enter or add a tag.