xC: fix libedit start from empty configuration

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014 - 2025, Přemysl Eric Janouch <p@janouch.name>
+Copyright (c) 2014 - 2026, Přemysl Eric Janouch <p@janouch.name>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted.

NEWS

@@ -3,6 +3,8 @@ Unreleased
  * xC: added more characters as nickname delimiters,
    so that @nick works as a highlight
 
+ * xC: fixed libedit crash with empty configuration, hackfixed Readline >= 8.3
+
  * xC: prevented rare crashes in relay code
 
  * xP: added a network lag indicator to the user interface

xC.c

@@ -1,7 +1,7 @@
 /*
  * xC.c: a terminal-based IRC client
  *
- * Copyright (c) 2015 - 2024, Přemysl Eric Janouch <p@janouch.name>
+ * Copyright (c) 2015 - 2026, Přemysl Eric Janouch <p@janouch.name>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted.
@@ -572,6 +572,8 @@ input_rl_buffer_switch (void *input, input_buffer_t input_buffer)
 {
 	struct input_rl *self = input;
 	struct input_rl_buffer *buffer = input_buffer;
+	if (!self->active)
+		return;
 
 	// There could possibly be occurences of the current undo list in some
 	// history entry.  We either need to free the undo list, or move it
@@ -16150,6 +16152,8 @@ main (int argc, char *argv[])
 	on_refresh_prompt (&ctx);
 	ctx.input->add_functions = input_add_functions;
 	CALL_ (ctx.input, start, argv[0]);
+	// We start input after creating the first buffer, so attach history
+	CALL_ (ctx.input, buffer_switch, ctx.current_buffer->input_data);
 	toggle_bracketed_paste (true);
 	reset_autoaway (&ctx);