Add menu and printscreen keys

These aren't typically used in the terminal but they are present on
many keyboards.

Also reorganize the named key constants a bit.  Between F500 and
ENCODE_DIRECT_BASE (F600) we have space for 256 named keys.

share/completions/bind.fish

@@ -72,7 +72,7 @@ function __fish_bind_complete
         printf '%sshift-\tShift modifier…\n' $prefix
         set -l key_names minus comma backspace delete escape \
             enter up down left right pageup pagedown home end insert tab \
-            space f(seq 12)
+            space menu printscreen f(seq 12)
         printf '%s\tNamed key\n' $prefix$key_names
     end
 end

src/input_common.rs

@@ -1114,6 +1114,8 @@ fn parse_csi(&mut self, buffer: &mut Vec<u8>) -> Option<Key> {
 
                 // Treat numpad keys the same as their non-numpad counterparts. Could add a numpad modifier here.
                 let key = match params[0][0] {
+                    57361 => key::PrintScreen,
+                    57363 => key::Menu,
                     57399 => '0',
                     57400 => '1',
                     57401 => '2',

src/key.rs

@@ -19,16 +19,18 @@
 pub(crate) const Right: char = '\u{F507}';
 pub(crate) const PageUp: char = '\u{F508}';
 pub(crate) const PageDown: char = '\u{F509}';
-pub(crate) const Home: char = '\u{F50a}';
-pub(crate) const End: char = '\u{F50b}';
-pub(crate) const Insert: char = '\u{F50c}';
-pub(crate) const Tab: char = '\u{F50d}';
-pub(crate) const Space: char = '\u{F50e}';
-pub(crate) const Invalid: char = '\u{F50f}';
+pub(crate) const Home: char = '\u{F50A}';
+pub(crate) const End: char = '\u{F50B}';
+pub(crate) const Insert: char = '\u{F50C}';
+pub(crate) const Tab: char = '\u{F50D}';
+pub(crate) const Space: char = '\u{F50E}';
+pub(crate) const Menu: char = '\u{F50F}';
+pub(crate) const PrintScreen: char = '\u{F510}';
 pub(crate) fn function_key(n: u32) -> char {
     assert!((1..=12).contains(&n));
-    char::from_u32(u32::from(Invalid) + n).unwrap()
+    char::from_u32(u32::from('\u{F5FF}') - n).unwrap()
 }
+pub(crate) const Invalid: char = '\u{F5FF}';
 
 const KEY_NAMES: &[(char, &wstr)] = &[
     ('-', L!("minus")),
@@ -48,6 +50,8 @@ pub(crate) fn function_key(n: u32) -> char {
     (Insert, L!("insert")),
     (Tab, L!("tab")),
     (Space, L!("space")),
+    (Menu, L!("menu")),
+    (PrintScreen, L!("printscreen")),
 ];
 
 #[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]