ipc: make --input-ipc-client terminate player on connection close

As discussed in the referenced issue. This is quite a behavior change,
bit since this option is new, and not included in any releases yet, I
think it's OK.

Fixes: #7648

DOCS/man/options.rst

@@ -3760,6 +3760,8 @@ Input
     In both cases, you must sure the FD is actually inherited by mpv (do not
     set the POSIX ``CLOEXEC`` flag).
 
+    The player quits when the connection is closed.
+
     This is somewhat similar to the removed ``--input-file`` option, except it
     supports only integer FDs, and cannot open actual paths.
 

input/ipc-unix.c

@@ -61,6 +61,7 @@ struct client_arg {
     const char *client_name;
     int client_fd;
     bool close_client_fd;
+    bool quit_on_close;
 
     bool writable;
 };
@@ -210,8 +211,14 @@ done:
     talloc_free(client_msg.start);
     if (arg->close_client_fd)
         close(arg->client_fd);
-    mpv_destroy(arg->client);
+    struct mpv_handle *h = arg->client;
+    bool quit = arg->quit_on_close;
     talloc_free(arg);
+    if (quit) {
+        mpv_terminate_destroy(h);
+    } else {
+        mpv_destroy(h);
+    }
     return NULL;
 }
 
@@ -252,6 +259,7 @@ static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, int fd)
             id >= 0 ? talloc_asprintf(client, "ipc-%d", id) : "ipc",
         .client_fd = fd,
         .close_client_fd = id >= 0,
+        .quit_on_close = id < 0,
         .writable = true,
     };