fts-flatcurve: Ensure that mailbox parameters are always truncated before changing

imapc: Fix imapc_features=guid-forced GUID generation

It was supposed to be only from header, but in some situations it included
the body as well.

lib-mail: istream-header-filter - Fix potential assert-crash

In some situations multiple snapshots were created, which broke the logic
of using a single snapshot_pending boolean. Changed it to refcount.

Fixes:
Panic: file istream-header-filter.c: line 665 (i_stream_header_filter_snapshot_free): assertion failed: (snapshot->mstream->snapshot_pending)

lib-regex: Fail if PCRE2_SUBSTITUTE_LITERAL is not supported by pcre2

lib-regex: Only use pcre2_substitute_callout_block() if it's available

lib-auth-client: auth-client-request - Fix panic occurring upon channel binding failure

Panic was:
imap-login: Panic: Can't create multiple passthrough events - finish the earlier with ->event()

auth: mech-oauth2 - Use lib-auth/auth-gs2

lib-sasl: mech-oauthbearer - Use lib-auth/auth-gs2

lib-auth: auth-scram-server - Use auth-gs2

lib-auth: auth-scram-client - Use auth-gs2

lib-auth: Add auth-gs2 API

lib-sasl: mech-oauthbearer - Use container_of()

auth: mech-oauth2 - Rename continued data to reponse data/payload

Makes more sense in SASL overall

auth: mech-oauth2 - Send openid-configuration result field only when available

auth: mech-oauth2 - Rework error handling

Treat passdb errors as "invalid_token" and treat request decoding problems as
"invalid_request" status, which makes more sense. Also simplify the overall
structure.

auth: mech-oauth2 - Don't send payload for internal error

auth: mech-oauth2 - Reorder mechanism functions

Makes more sense this way.

auth: mech-oauth2 - Rename oauth2_send_failure() to oauth2_fail()

Makes more sense; it also fails the request.

auth: mech-oauth2 - Improve use of json-ostream

auth: mech-oauth2 - Use str functions rather than direct access to underlying buffer_t

auth: mech-oauth2 - Rename reply buffer in oauth2_send_failure()

lib-sasl: Reformat mech-oauthbearer.c

auth: Reformat mech-oauth2.c

lib: test-istream-multiplex - Fix randomly trying to create 0 length variable array

Fixes:
test-istream-multiplex.c:184:29: runtime error: variable length array bound evaluates to non-positive value 0

dovecot-config: Add lib-regex

fts: Change default fts_search_read_fallback=no for Pro

config: import_environment - Allow spaces in values by separating them with tabs

config: doveconf - Don't store unused import_environment

config: config_connection_request() - Don't store unused import_environment

acl: Fix crash when group ACLs are used, but user's acl_groups is empty

lib: macros - Prevent using libc regex

lib-var-expand: Use lib-regex instead of libc regex

lib-dovecot: Add lib-regex

lib-regex: Add regex matching library

autoconf: Add libcpre2 detection

lib: macros - Use __typeof__ instead of typeof from C11 onwards

typeof and __typeof__ are not standard until C23, and C11
requires using __typeof__.

lib-auth-client: auth-master - Remove useless NULL check in auth_master_connection_output()

Found by Coverity (#41969)

lib-auth-client: auth-master - Fix potential segfault in auth_master_wait()

Found by Coverity (#41970).

lib-auth-client: test-auth-master - Add tests for parallel requests

lib-auth-client: auth-master - Fix handling of parallel replies

doveadm: Print table formatter - Print empty values as "-"

It's more readable to see empty values as "-" in a table.

doveadm: Add named initializers to print drivers

lib-auth-client: auth-master - Improve some of the connection failure messages returned to caller

lib-auth-client: auth-master - Drop AUTH_MASTER_FLAG_NO_INNER_IOLOOP flag

It is no longer needed for testing, as async requests can be used instead.

lib-auth-client: test-auth-master - Add tests for asynchronous userdb/passdb lookups

lib-auth-client: auth-master - Allocate passdb/userdb lookup structs on default pool

lib-auth-client: auth-master - Make asynchronous userdb and passdb lookups available

lib-auth-client: auth-master - Define sub-class structure for userdb lookup

lib-auth-client: auth-master - Split off auth_master_user_lookup_start() from auth_master_user_lookup()

lib-auth-client: auth-master - Split off auth_master_user_lookup_finished() from auth_master_user_lookup()

lib-auth-client: auth-master - Define sub-class structure for passdb lookup

lib-auth-client: auth-master - Split off auth_master_pass_lookup_start() from auth_master_pass_lookup()

lib-auth-client: auth-master - Split off auth_master_pass_lookup_finished() from auth_master_pass_lookup()

lib-auth-client: auth-master - Introduce local variable for result in auth_lookup_reply_callback()

lib-auth-client: auth-master - Add internal support for initiating invalid requests

This avoids the need to return a NOTFOUND code at request creation when the
request is already known to fail. This is a means to handle this asynchronously.

lib-auth-client: auth-master - Make sending of requests fully asynchronous

lib-auth-client: auth-master - Add debug messages

lib-auth-client: auth-master - Add support for request destroy callback

lib-auth-client: auth-master - Implement auth_master_wait()

This allows waiting until all submitted requests are finished.

lib-auth-client: auth-master - Make request reply handling asynchronous

lib-auth-client: auth-master-request - Use request struct as argument for auth_master_request_send()

lib-auth-client: auth-master - Use new struct auth_master_request for request handling

lib-auth-client: auth-master - Allow duplicate calls to auth_master_unset_io()

lib-auth-client: auth-master - Handle connection failures in auth_master_connection_failure()

lib-auth-client: auth-master - Improve debug logging in auth_lookup_reply_callback()

lib-auth-client: auth-master - Compose command line at a single location

lib-auth-client: auth-master - Drop unnecessary and confusing additional connection events

Only use conn->conn.event instead.

lib-auth-client: auth-master - Do not switch connection event to lookup event during lookup

lib-auth-client: auth-master - Absorb auth_master_event_create()

lib-auth-client: auth-master - Place lookup event in lookup context struct

lib-auth-client: auth-master - Properly parse SPID sent from server

This is currently not used though.

lib-auth-client: auth-master - Call io_loop_stop() at a single location

lib-auth-client: auth-master - Consolidate reply_callback arguments into a reply struct

lib-auth-client: auth-master - Restructure reply parsing

Now it parses the received id into an integer rather than converting the expected id to a string.

lib-auth-client: auth-master - Change reply_callback return type to int

lib-auth-client: auth-master - Add reference counting for the connection object

lib-auth-client: auth-master - Allocate the connection on an alloconly pool

lib-auth-client: auth-master - Restructure auth_user_list_reply_callback()

lib-auth-client: auth-master - Add structural comments

lib-auth-client: auth-master - Rename auth_idle_timeout() to auth_master_idle_timeout()

lib-auth-client: auth-master - Rename conn->request_counter to conn->id_counter

This is shorter and consistent with lib-master/master-login-auth.

lib-auth-client: auth-master - Rename struct auth_master_lookup_ctx to struct auth_master_lookup

lib-auth-client: auth_master - Rename "cmd" parameter to parse_reply() to "reply"

lib-auth-client: auth-master - Move auth_idle_timeout()

lib-auth-client: auth-master - Move auth_master_pass_lookup()

lib-auth-client: auth-master - Move auth_master_cache_flush()

lib-auth-client: auth-master - Move request-related code to new auth-master-request.c

lib-auth-client: auth-master - Make auth_master_connect() public

lib-auth-client: auth-master - Rename auth_connection_close() to auth_master_disconnect() and make it public

lib-auth-client: auth-master - Move call to auth_request_lookup_abort() to central place

This is a preparation for a later changes that add more abort invokations.

lib-auth-client: auth-master - Move definitions to new auth-master-private.h

lib-auth-client: auth-master - Move auth master connection function definitions in header

lib-auth-client: auth-master - Move timeout callbacks

lib-auth-client: auth-master - Move definition of struct auth_master_user_list_ctx

lib-auth-client: auth-master - Move definition of struct auth_master_lookup_ctx

lib-auth-client: auth-master - Move auth_request_lookup_abort()

lib-auth-client: auth-master - Move is_valid_string()

lib-auth-client: auth-master - Move args_hide_passwords()

lib-auth-client: auth-master - Move parse_reply()

lib-auth-client: auth-master - Move auth_lookup_reply_callback()