With the recent keynav changes, the keyboard focus can now move
away from the search entry while a search is active. While we
keep the focus entry style while a search is active, we set the
cursor visibility depending on whether the entry has focus. This
doesn't seem very logical, so always request to show the cursor
when we appear focused.
Note that at least for now we are just expressing intent, as clutter
never draws the cursor for unfocused entries.
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