apprt/gtk: comments

src/apprt/gtk/class/search_overlay.zig

@@ -185,6 +185,9 @@ pub const SearchOverlay = extern struct {
     pub fn grabFocus(self: *Self) void {
         const priv = self.private();
         _ = priv.search_entry.as(gtk.Widget).grabFocus();
+
+        // Select all text in the search entry field. -1 is distance from
+        // the end, causing the entire text to be selected.
         priv.search_entry.as(gtk.Editable).selectRegion(0, -1);
     }