Work around wants_terminal not begin set inside eval

On this binding we fail to disable CSI u

    bind c-t '
        begin
            set -lx FZF_DEFAULT_OPTS --height 40% --bind=ctrl-z:ignore
            eval fzf | while read -l r; echo read $r; end
        end
    '

because for "fzf", ParseExecutionContext::setup_group() returns early with the
parent process group (which should be fish's own) , hence "wants_terminal"
is false. This seems questionable, I don't think the eval should make a
difference here.

For now, don't touch it; use the more accurate way of detecting whether
a process may read keyboard input. In many of such cases "wants_terminal"
is false, like

    echo (echo 1\n2\n3 | fzf)

Fixes #10504

src/builtins/fg.rs

@@ -147,10 +147,11 @@ pub fn fg(parser: &Parser, streams: &mut IoStreams, argv: &mut [&wstr]) -> Optio
     {
         let job_group = job.group();
         job_group.set_is_foreground(true);
-        let tmodes = job_group.tmodes.borrow();
+        if job.entitled_to_terminal() {
-        if job_group.wants_terminal() {
             terminal_protocols_disable_ifn();
-            if tmodes.is_some() {
+        }
+        let tmodes = job_group.tmodes.borrow();
+        if job_group.wants_terminal() && tmodes.is_some() {
             let termios = tmodes.as_ref().unwrap();
             let res = unsafe { libc::tcsetattr(STDIN_FILENO, TCSADRAIN, termios) };
             if res < 0 {
@@ -158,7 +159,6 @@ pub fn fg(parser: &Parser, streams: &mut IoStreams, argv: &mut [&wstr]) -> Optio
             }
         }
     }
-    }
     let mut transfer = TtyTransfer::new();
     transfer.to_job_group(job.group.as_ref().unwrap());
     let resumed = job.resume();

src/exec.rs

@@ -72,7 +72,7 @@ pub fn exec_job(parser: &Parser, job: &Job, block_io: IoChain) -> bool {
         return true;
     }
 
-    if job.group().wants_terminal() {
+    if job.entitled_to_terminal() {
         terminal_protocols_disable_ifn();
     }
 

src/proc.rs

@@ -886,6 +886,10 @@ impl Job {
         self.group().wants_job_control()
     }
 
+    pub fn entitled_to_terminal(&self) -> bool {
+        self.group().is_foreground() && self.processes().iter().any(|p| !p.is_internal())
+    }
+
     /// Return whether this job is initially going to run in the background, because & was
     /// specified.
     pub fn is_initially_background(&self) -> bool {

tests/pexpects/history.py

@@ -192,7 +192,7 @@ expect_prompt("nonephemeral! line")
 sendline("true")
 expect_prompt()
 sendline("echo a; history search '*ephemeral!*' | cat; echo b")
-expect_prompt("a\r\necho nonephemeral! line\r\nb\r\n")
+expect_prompt(r"a\r\n.*echo nonephemeral! line\r\nb\r\n")
 
 # If fish_should_add_to_history exists, it will completely take over,
 # so even lines with spaces are stored
@@ -201,4 +201,4 @@ expect_prompt("spaced")
 sendline("true")
 expect_prompt()
 sendline("echo a; history search '*spaced*' | cat; echo b")
-expect_prompt("a\r\n echo spaced\r\nb\r\n")
+expect_prompt("a\r\n.* echo spaced\r\nb\r\n")

tests/pexpects/read.py

@@ -13,7 +13,7 @@ send, sendline, sleep, expect_prompt, expect_re, expect_str = (
 
 
 def expect_read_prompt():
-    expect_re(r"\r\n?read> $")
+    expect_re(r"\r\n?read> .*$")
 
 
 def expect_marker(text):