test: improve test_mutt_date_parse_imap()

test: improve test_mutt_date_parse_date()

test: improve test_mutt_date_normalize_time()

test: improve test_mutt_date_make_tls()

test: improve test_mutt_date_make_time()

test: improve test_mutt_date_make_imap()

test: improve test_mutt_date_make_date()

test: improve test_mutt_date_localtime_format()

test: improve test_mutt_date_localtime()

test: improve test_mutt_date_local_tz()

test: improve test_mutt_date_is_day_name()

test: improve test_mutt_date_gmtime()

test: improve test_mutt_date_check_month()

test: improve test_mutt_date_add_timeout()

date: move defines, so they can be used for testing

merge: improve list tests

 * test: ignore mutt_exit()
 * test: add shared list testing code
 * test: improve test_mutt_list_clear()
 * test: improve test_mutt_list_compare()
 * test: improve test_mutt_list_find()
 * test: improve test_mutt_list_free()
 * test: improve test_mutt_list_free_type()
 * test: improve test_mutt_list_insert_after()
 * test: improve test_mutt_list_insert_head()
 * test: improve test_mutt_list_insert_tail()
 * test: improve test_mutt_list_match()

test: improve test_mutt_list_match()

test: improve test_mutt_list_insert_tail()

test: improve test_mutt_list_insert_head()

test: improve test_mutt_list_insert_after()

test: improve test_mutt_list_free_type()

test: improve test_mutt_list_free()

test: improve test_mutt_list_find()

test: improve test_mutt_list_compare()

test: improve test_mutt_list_clear()

test: add shared list testing code

test: ignore mutt_exit()

doc: add example to find all maildir mailboxes

test: fix test failures

Fix list-reply regression introduced when converting Address to TAILQ

Fixes #1724

make OP_HALF_{UP,DOWN} behave symmetric.

  - the calculation of number of lines to scroll up/down should not
  depend on whether the number of rows in the pager/index/terminal is
  odd or even.
  - this patch will make the behaviour symmetric such that in both cases
  (even/odd number of rows) scrolling up and down by half a page (or the
  other way round) will get you back to the exact same line as before.

merge: improve string tests

 * test: improve test_mutt_str_adjust()
 * test: improve test_mutt_str_append_item()
 * test: improve test_mutt_str_asprintf()
 * test: improve test_mutt_str_dequote_comment()
 * test: improve test_mutt_str_find_word()
 * test: improve test_mutt_str_getenv()
 * test: improve test_mutt_str_inline_replace()
 * test: improve test_mutt_str_is_ascii()
 * test: improve test_mutt_str_is_email_wsp()
 * test: improve test_mutt_str_lws_len()
 * test: improve test_mutt_str_lws_rlen()
 * test: improve test_mutt_str_next_word()
 * test: improve test_mutt_str_pretty_size()
 * test: improve test_mutt_str_remall_strcasestr()
 * test: improve test_mutt_str_remove_trailing_ws()
 * test: improve test_mutt_str_replace()
 * test: improve test_mutt_str_rstrnstr()
 * test: improve test_mutt_str_skip_email_wsp()
 * test: improve test_mutt_str_skip_whitespace()
 * test: improve test_mutt_str_split()
 * test: improve test_mutt_str_startswith()
 * test: improve test_mutt_str_strcasecmp()
 * test: improve test_mutt_str_strcasestr()
 * test: improve test_mutt_str_strcat()
 * test: improve test_mutt_str_strchrnul()
 * test: improve test_mutt_str_strcmp()
 * test: improve test_mutt_str_strcoll()
 * test: improve test_mutt_str_strdup()
 * test: improve test_mutt_str_strfcpy()
 * test: improve test_mutt_str_stristr()
 * test: improve test_mutt_str_strlen()
 * test: improve test_mutt_str_strlower()
 * test: improve test_mutt_str_strncasecmp()
 * test: improve test_mutt_str_strncat()
 * test: improve test_mutt_str_strncmp()
 * test: improve test_mutt_str_strnfcpy()
 * test: improve test_mutt_str_substr_cpy()
 * test: improve test_mutt_str_substr_dup()
 * test: improve test_mutt_str_word_casecmp()

test: improve test_mutt_str_word_casecmp()

test: improve test_mutt_str_substr_dup()

test: improve test_mutt_str_substr_cpy()

test: improve test_mutt_str_strnfcpy()

test: improve test_mutt_str_strncmp()

test: improve test_mutt_str_strncat()

test: improve test_mutt_str_strncasecmp()

test: improve test_mutt_str_strlower()

test: improve test_mutt_str_strlen()

test: improve test_mutt_str_stristr()

test: improve test_mutt_str_strfcpy()

test: improve test_mutt_str_strdup()

test: improve test_mutt_str_strcoll()

test: improve test_mutt_str_strcmp()

test: improve test_mutt_str_strchrnul()

test: improve test_mutt_str_strcat()

test: improve test_mutt_str_strcasestr()

test: improve test_mutt_str_strcasecmp()

test: improve test_mutt_str_startswith()

test: improve test_mutt_str_split()

test: improve test_mutt_str_skip_whitespace()

test: improve test_mutt_str_skip_email_wsp()

test: improve test_mutt_str_rstrnstr()

test: improve test_mutt_str_replace()

test: improve test_mutt_str_remove_trailing_ws()

test: improve test_mutt_str_remall_strcasestr()

test: improve test_mutt_str_pretty_size()

test: improve test_mutt_str_next_word()

test: improve test_mutt_str_lws_rlen()

test: improve test_mutt_str_lws_len()

test: improve test_mutt_str_is_email_wsp()

test: improve test_mutt_str_is_ascii()

test: improve test_mutt_str_inline_replace()

test: improve test_mutt_str_getenv()

test: improve test_mutt_str_find_word()

test: improve test_mutt_str_dequote_comment()

test: improve test_mutt_str_asprintf()

test: improve test_mutt_str_append_item()

test: improve test_mutt_str_adjust()

merge: improve Buffer tests

 * test: improve test_mutt_buffer_add_printf()
 * test: improve test_mutt_buffer_addch()
 * test: improve test_mutt_buffer_addstr()
 * test: improve test_mutt_buffer_addstr_n()
 * test: improve test_mutt_buffer_alloc()
 * test: improve test_mutt_buffer_concat_path()
 * test: improve test_mutt_buffer_fix_dptr()
 * test: improve test_mutt_buffer_free()
 * test: improve test_mutt_buffer_from()
 * test: improve test_mutt_buffer_increase_size()
 * test: improve test_mutt_buffer_init()
 * test: improve test_mutt_buffer_is_empty()
 * test: improve test_mutt_buffer_len()
 * test: improve test_mutt_buffer_new()
 * test: improve test_mutt_buffer_printf()
 * test: improve test_mutt_buffer_reset()
 * test: improve test_mutt_buffer_strcpy()
 * test: improve test_mutt_buffer_strcpy_n()
 * reorganise buffer header

reorganise buffer header

test: improve test_mutt_buffer_strcpy_n()

test: improve test_mutt_buffer_strcpy()

test: improve test_mutt_buffer_reset()

test: improve test_mutt_buffer_printf()

test: improve test_mutt_buffer_new()

test: improve test_mutt_buffer_len()

test: improve test_mutt_buffer_is_empty()

test: improve test_mutt_buffer_init()

test: improve test_mutt_buffer_increase_size()

coverity

test: improve test_mutt_buffer_from()

move the null logger into libmutt

This logger is used by the test code (for quietness).

test: improve test_mutt_buffer_free()

remove unnecessary test in mutt_mem_calloc()

There's no point in making a calculation.
Either calloc() succeeds, or it doesn't.

test: improve test_mutt_buffer_fix_dptr()

fix idn macro

gcc9 isn't happy with pre-proc conditionals inside a macro.

test: improve test_mutt_buffer_concat_path()

test: improve test_mutt_buffer_alloc()

test: improve test_mutt_buffer_addstr_n()

test: improve test_mutt_buffer_addstr()

test: improve test_mutt_buffer_addch()

test: improve test_mutt_buffer_add_printf()

Fix Coverity CID 198652

Fix Coverity CID 198656 / 198649

fix: improve function checks

fix: stop CUR_EMAIL underflow in entire-thread

entire-thread will underflow CUR_EMAIL macro if no mailbox is
configured. To prevent this, call 'prereq()' before any other logic.
'prereq()' will ensure we have a mailbox thus preventing the underflow.

flatcap deserves credit for identifying the solution.

Fixes: #1719

Pass the test for mutt_addrlist_to_intl when building wihtout idn