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Preserve the actions' initial indentation. For instance, on
| %define api.value.type {int}
| %%
| exp: exp '/' exp { if ($3)
| $$ = $1 + $3;
| else
| $$ = 0; }
we used to generate
| { if (yyvsp[0])
| yyval = yyvsp[-2] + yyvsp[0];
| else
| yyval = 0; }
now we produce
| { if (yyvsp[0])
| yyval = yyvsp[-2] + yyvsp[0];
| else
| yyval = 0; }
See https://lists.gnu.org/archive/html/bison-patches/2019-06/msg00012.html.
* data/skeletons/bison.m4 (b4_symbol_action): Output the code in
column 0, leave indentation matters to the C code.
* src/output.c (user_actions_output): Preserve the incoming
indentation in the output.
(prepare_symbol_definitions): Likewise for %printer/%destructor.
* tests/synclines.at (Output columns): New.