Add back Drop glue for terminal types

It's somewhat catastrophic to not reset console mode and code pages on
Windows - it seems to really mess up the terminal and can cause a crash
- so I think it's fine to reset mode automatically on drop. While we're
at it we might as well flush the writer buffers.

examples/detect-features.rs

@@ -70,7 +70,6 @@ fn main() -> io::Result<()> {
             other => eprintln!("unexpected event: {other:?}\r"),
         }
     }
-    terminal.reset_mode()?;
     println!("Detected features: {features:?}");
 
     Ok(())

examples/event-read.rs

@@ -124,8 +124,6 @@ fn main() -> io::Result<()> {
         decreset!(SGRMouse),
     )?;
 
-    terminal.reset_mode()?;
-
     Ok(())
 }
 

src/terminal/unix.rs

@@ -1,7 +1,7 @@
 use rustix::termios::{self, Termios};
 use std::{
     fs,
-    io::{self, BufWriter, IsTerminal as _},
+    io::{self, BufWriter, IsTerminal as _, Write as _},
     os::unix::prelude::*,
 };
 
@@ -141,12 +141,8 @@ impl Terminal for UnixTerminal {
     }
 
     fn reset_mode(&mut self) -> io::Result<()> {
-        termios::tcsetattr(
-            self.write.get_ref(),
-            termios::OptionalActions::Now,
-            &self.original_termios,
-        )?;
-        Ok(())
+        // NOTE: this is the same as entering cooked mode on Unix but involves more on Windows.
+        self.enter_cooked_mode()
     }
 
     fn get_dimensions(&self) -> io::Result<(u16, u16)> {
@@ -174,6 +170,13 @@ impl Terminal for UnixTerminal {
     }
 }
 
+impl Drop for UnixTerminal {
+    fn drop(&mut self) {
+        let _ = self.flush();
+        let _ = self.reset_mode();
+    }
+}
+
 impl io::Write for UnixTerminal {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.write.write(buf)

src/terminal/windows.rs

@@ -392,6 +392,13 @@ impl Terminal for WindowsTerminal {
     }
 }
 
+impl Drop for WindowsTerminal {
+    fn drop(&mut self) {
+        let _ = self.flush();
+        let _ = self.reset_mode();
+    }
+}
+
 impl io::Write for WindowsTerminal {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.output.write(buf)