Notice when exit has been run from within fish_prompt

This allows `exit` to tell the reader to stop, when run inside
fish_prompt. Fixes #8033.

CHANGELOG.rst

@@ -51,6 +51,7 @@ Interactive improvements
 - fish now tries to find a Unicode-aware locale for encoding (``LC_CTYPE``) if started without any locale information, improving the display of emoji and other non-ASCII text on misconfigured systems (:issue:`8031`). To allow a C locale, set the variable ``fish_allow_singlebyte_locale`` to 1.
 - The Web-based configuration and documentation now feature a dark mode if the browser requests it (:issue:`8043`).
 - Color variables can now also be given like ``--background red`` and ``-b red``, not just ``--background=red`` (:issue:`8053`).
+- ``exit`` run within ``fish_prompt`` now exits properly (:issue:`8033`).
 
 New or improved bindings
 ^^^^^^^^^^^^^^^^^^^^^^^^

src/reader.cpp

@@ -1313,6 +1313,10 @@ void reader_data_t::exec_prompt() {
     // may still be output on the line from the previous command (#2499) and we need our PROMPT_SP
     // hack to work.
     reader_write_title(L"", parser(), false);
+
+    // Some prompt may have requested an exit (#8033).
+    this->exit_loop_requested |= parser().libdata().exit_current_script;
+    parser().libdata().exit_current_script = false;
 }
 
 void reader_init() {