The find field (Ctrl+F) adds text on each new search.

On GUI applications, conventionally, each new find shows the previous search pattern, entirely selected. The reason is that, if the user types something new, the old pattern is automatically replaced; if they press enter instead, the old pattern is used.

This was also Libreoffice's behavior, before v7.

Now, instead, when the find field is opened, the previous pattern is not highlighted, so if the user types something new, it's prefixed to the old one.

This is very confusing, and it seems to me that it's a bug introduced, rather than intentional design.

Searching a new pattern now requires the user to type `Ctrl+A` after `Ctrl+F`, which is hard to remember, since the previous behavior is the convention in all GUI applications.