avoid cnorm on certain terminals

using a terminfo's cnorm doesn't reset the cursor for many terminals,
see issue: helix-editor#10089

helix-tui/src/backend/crossterm.rs

@@ -23,13 +23,32 @@ use std::{
  fmt,
  io::{self, Write},
 };
+use termini::TermInfo;
 
 fn term_program() -> Option<String> {
- std::env::var("TERM_PROGRAM").ok()
+ // Some terminals don't set $TERM_PROGRAM
+ match std::env::var("TERM_PROGRAM") {
+ Err(_) => std::env::var("TERM").ok(),
+ Ok(term_program) => Some(term_program),
+ }
 }
 fn vte_version() -> Option<usize> {
  std::env::var("VTE_VERSION").ok()?.parse().ok()
 }
+fn reset_cursor_approach(terminfo: TermInfo) -> String {
+ let Some(termini::Value::Utf8String(se_str)) = terminfo.extended_cap("Se") else {
+ return "".to_string();
+ };
+
+ format!(
+ "{}{}{}",
+ "\x1B[0 q",
+ se_str,
+ terminfo
+ .utf8_string_cap(termini::StringCapability::CursorNormal)
+ .unwrap()
+ )
+}
 
 /// Describes terminal capabilities like extended underline, truecolor, etc.
 #[derive(Clone, Debug)]
@@ -69,10 +88,7 @@ impl Capabilities {
  || t.extended_cap("Su").is_some()
  || vte_version() >= Some(5102)
  || matches!(term_program().as_deref(), Some("WezTerm")),
- reset_cursor_command: t
- .utf8_string_cap(termini::StringCapability::CursorNormal)
- .unwrap_or("\x1B[0 q")
- .to_string(),
+ reset_cursor_command: reset_cursor_approach(t),
  },
  }
  }