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Fix handling of permanent-local variables in 'kill-all-local-variables'

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The original implementation went too far and caused unexpected
results.
* src/buffer.c (reset_buffer_local_variables): Second argument is
now 'int', and can be 0, 1, or 2.
(Fkill_all_local_variables): Call 'reset_buffer_local_variables'
with 2nd argument 2 if KILL-PERMANENT is non-nil.  (Bug#74091)
This commit is contained in:
Eli Zaretskii 2024-11-10 20:49:45 +02:00
parent c96e576090
commit 90c97d3fac
1 changed files with 7 additions and 6 deletions
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13
src/buffer.c
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@ -113,7 +113,7 @@ static int last_per_buffer_idx;
static void call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay,
bool after, Lisp_Object arg1,
Lisp_Object arg2, Lisp_Object arg3);
static void reset_buffer_local_variables (struct buffer *, bool);
static void reset_buffer_local_variables (struct buffer *, int);
/* Alist of all buffer names vs the buffers. This used to be
a Lisp-visible variable, but is no longer, to prevent lossage
@ -1112,10 +1112,11 @@ reset_buffer (register struct buffer *b)
Instead, use Fkill_all_local_variables.
If PERMANENT_TOO, reset permanent buffer-local variables.
If not, preserve those. */
If not, preserve those. PERMANENT_TOO = 2 means ignore
the permanent-local property of non-builtin variables. */
static void
reset_buffer_local_variables (struct buffer *b, bool permanent_too)
reset_buffer_local_variables (struct buffer *b, int permanent_too)
{
int offset, i;
@ -1141,7 +1142,7 @@ reset_buffer_local_variables (struct buffer *b, bool permanent_too)
bset_invisibility_spec (b, Qt);
/* Reset all (or most) per-buffer variables to their defaults. */
if (permanent_too)
if (permanent_too == 1)
bset_local_var_alist (b, Qnil);
else
{
@ -1170,7 +1171,7 @@ reset_buffer_local_variables (struct buffer *b, bool permanent_too)
swap_in_global_binding (XSYMBOL (sym));
}
if (!NILP (prop))
if (!NILP (prop) && !permanent_too)
{
/* If permanent-local, keep it. */
last = tmp;
@ -3001,7 +3002,7 @@ the normal hook `change-major-mode-hook'. */)
/* Actually eliminate all local bindings of this buffer. */
reset_buffer_local_variables (current_buffer, !NILP (kill_permanent));
reset_buffer_local_variables (current_buffer, !NILP (kill_permanent) ? 2 : 0);
/* Force mode-line redisplay. Useful here because all major mode
commands call this function. */