fix(gui): reach every table row and choose rows from the keyboard

CHANGELOG.md

@@ -7,6 +7,13 @@ The format follows [Keep a Changelog](https://keepachangelog.com/); versions fol
 
 ### Fixed
 
+- **Every row of a table can be scrolled into view, and tables work from the
+  keyboard.** The last rows of every table (Connections, the event log, Port check,
+  Sockets) could not be reached, a short table could not scroll at all, and Page Down
+  skipped rows. Up, Down, Page Up, Page Down, Home and End now move the selection, and
+  with Shift they select a range across pages. A selected row stays selected when it
+  scrolls out of view, so Ctrl+C and Shift+F10 keep working on it.
+
 - **100% loss with "Losses in a row" set now loses every packet.** A run length used to
   let 11 to 33% of packets through, including during the full outage in the
   `mobile-lte-to-3g` scenario, and the log and the summary described runs of loss that

README.md

@@ -248,6 +248,7 @@ effect.
 | `Ctrl+S` / `Ctrl+O` | Save / Load config file |
 | `Ctrl+L` | Clear the log |
 | `Ctrl+F` | Search: the field search on Control, the table search on Connections, the socket search on Tools > Sockets |
+| `Up` / `Down`, `Page Up` / `Page Down`, `Home` / `End` | In a table: move the selection. With `Shift`, select a range, which can run past one screen. `Ctrl+C` copies the selected rows and `Shift+F10` opens the right-click menu |
 
 **Finding a setting.** The box at the top of the Control page searches the settings by name -
 type part of a field or section name, or the command-line flag such as `--loss`. Every match is