Fix line numbers in functions

This added the function offset *again*, but it's already included in
the line for the current file.

And yes, I have explicitly tested a function file with a function
defined at a later line.

Fixes #6350

src/parser.cpp

@@ -484,12 +484,6 @@ int parser_t::get_lineno() const {
     int lineno = -1;
     if (execution_context) {
         lineno = execution_context->get_current_line_number();
-
-        // If we are executing a function, we have to add in its offset.
-        const wchar_t *function_name = is_function();
-        if (function_name != nullptr) {
-            lineno += function_get_definition_lineno(function_name);
-        }
     }
     return lineno;
 }

tests/checks/line-number.fish

@@ -0,0 +1,29 @@
+# RUN: %fish %s
+#
+# These lines left around because we need the line numbers.
+# This file in general requires careful editing in the middle, I recommend appending.
+function t --on-event linenumber
+    status line-number
+    status line-number
+    status line-number
+end
+
+emit linenumber
+# CHECK: 6
+# CHECK: 7
+# CHECK: 8
+
+type --nonexistent-option-so-we-get-a-backtrace
+# CHECKERR: type: Unknown option '--nonexistent-option-so-we-get-a-backtrace'
+# CHECKERR: {{.*/type.fish}} (line 7):
+# CHECKERR:    argparse -n type -x t,p,P $options -- $argv
+# CHECKERR:    ^
+# CHECKERR: in function 'type' with arguments '--nonexistent-option-so-we-get-a-backtrace'
+# CHECKERR:     called on line 16 of file {{.*}}line-number.fish
+
+function line-number
+    status line-number
+end
+
+line-number
+# CHECK: 25