cli: set LESS=FRX when running $PAGER

cli/src/ui.rs

@@ -132,7 +132,11 @@ impl UiOutput {
     fn new_paged(pager_cmd: &CommandNameAndArgs) -> io::Result<UiOutput> {
         let mut cmd = pager_cmd.to_command();
         tracing::info!(?cmd, "spawning pager");
-        let mut child = cmd.stdin(Stdio::piped()).spawn()?;
+        // LESS=FRX causes escape sequences to render correctly when PAGER=less
+        // It's harmless when using other pagers
+        let mut child = cmd
+            .env("LESS", "FRX")
+            .stdin(Stdio::piped()).spawn()?;
         let child_stdin = child.stdin.take().unwrap();
         Ok(UiOutput::Paged { child, child_stdin })
     }