Relax the ASCII constraint for ALT, and add support for LOGO.

Traditionally only ASCII characters can be sent with the ALT key. This
is an arbitrary restriction than I have relaxed. This means now ALT+ñ
will produce '^[ñ' on the terminal as expected.

I have also added support for the Windows key to send the escapesequence
'\x1b@\x1b\' so a mapping can be created in Vim for something like
'<M-@><M-\>t' for Windows+t.

In addition, it's worth noting that Glutin does not differentiate
between the windows key and the hyper key, so if one is relatively
perverse like me and has a hyper key, it can be used to sent logo keys
to the terminal without X intercepting it.

1 files changed, 8 insertions, 1 deletions

diff --git a/alacritty/src/input.rs b/alacritty/src/input.rs
index 98a1b723..b8ae4b00 100644
--- a/alacritty/src/input.rs
+++ b/alacritty/src/input.rs
@@ -799,11 +799,18 @@ impl<T: EventListener, A: ActionContext<T>> Processor<T, A> {
         if self.ctx.config().ui_config.alt_send_esc
             && *self.ctx.received_count() == 0
             && self.ctx.modifiers().alt()
-            && utf8_len == 1
         {
             bytes.insert(0, b'\x1b');
         }
 
+        if self.ctx.modifiers().logo()
+        {
+            bytes.insert(0, b'\\');
+            bytes.insert(0, b'\x1b');
+            bytes.insert(0, b'@');
+            bytes.insert(0, b'\x1b');
+        }
+
         self.ctx.write_to_pty(bytes);
 
         *self.ctx.received_count() += 1;