Turn "deprecations" into "deprecations and planned changes"

This captures the intent better, as some changes are indeed plain
deprecations leading to removal, but other changes can be viewed
as minor tune-ups instead.

docs/Readme.md

@@ -36,4 +36,4 @@ Other:
 * [Open Source Projects using Catch](opensource-users.md#top)
 * [Contributing](contributing.md#top)
 * [Release Notes](release-notes.md#top)
-* [Deprecations](deprecations.md#top)
+* [Deprecations and incoming changes](deprecations.md#top)

docs/deprecations.md

@@ -1,63 +1,86 @@
 <a id="top"></a>
 # Deprecations and incoming changes
 
-**Contents**<br>
+This page documents current deprecations and upcoming planned changes
-[Verbosities](#verbosities)<br>
+inside Catch2. The difference between these is that a deprecated feature
-[`--list-*` command line parameters](#--list--command-line-parameters)<br>
+will be removed, while a planned change to a feature means that the
-[Types passed to the reporter interface](#types-passed-to-the-reporter-interface)<br>
+feature will behave differently, but will still be present. Obviously,
-[Generators](#generators)<br>
+either of these is a breaking change, and thus will not happen until
-[`ANON_TEST_CASE`](#anon_test_case)<br>
+at least the next major release.
-[Secondary description amongst tags](#secondary-description-amongst-tags)<br>
-
-This page documents current deprecations and upcoming changes inside
-Catch2. You can expect deprecated functionality to stick around until
-the next major release, but not for longer.
 
 
-## Verbosities
+## Deprecations
 
-The current implementation of verbosities has been misguided and will
+### `--list-*` return values
-be removed. Note that this does not mean verbosities will be gone, just
+
-that they will no longer be checked up-front, and a reporter can handle
+The return codes of the `--list-*` family of command line arguments
-verbosity however it sees fit (including ignoring it).
+will no longer be equal to the number of tests/tags/etc found, instead
+it will be 0 for success and non-zero for failure.
 
 
-## `--list-*` command line parameters
+### `--list-test-names-only`
 
-There will be 3 large changes to the `--list-*` family of command line
+`--list-test-names-only` command line argument will be removed.
-parameters.
-
-* Their return codes will no longer reflect the number of tests/tags/etc
-that were found, instead it will be 0 for success and non-zero for failure.
-* Their output will be piped through reporters, so that e.g. XML reporter
-will write the output as a machine-readable XML, while the console
-reporter will keep the current output.
-* `--list-test-names-only` will be completely removed.
 
 
-## Types passed to the reporter interface
+### `ANON_TEST_CASE`
-
-To allow changes in internal representation, we are planning to change
-the arguments provided to functions in the reporter interface.
-
-
-## Generators
-
-The current generator interface is not intended to be stable and will be
-changed.
-
-
-## `ANON_TEST_CASE`
 
 `ANON_TEST_CASE` is scheduled for removal, as it can be fully replaced
 by a `TEST_CASE` with no arguments.
 
 
-## Secondary description amongst tags
+### Secondary description amongst tags
 
 Currently, the tags part of `TEST_CASE` (and others) macro can also
-contain text that is not part of tags. As it is not actually documented,
+contain text that is not part of tags. This text is then separated into
-or used, it will be removed.
+a "description" of the test case, but the description is then never used
+apart from writing it out for `--list-tests -v high`.
+
+Because it isn't actually used nor documented, and brings complications
+to Catch2's internals, description support will be removed.
+
+
+## Planned changes
+
+
+### Reporter verbosities
+
+The current implementation of verbosities, where the reporter is checked
+up-front whether it supports the requested verbosity, is fundamentally
+misguided and will be changed. The new implementation will no longer check
+whether the specified reporter supports the requested verbosity, instead
+it will be up to the reporters to deal with verbosities as they see fit
+(with an expectation that unsupported verbosities will be, at most,
+warnings, but not errors).
+
+
+### Output format of `--list-*` command line parameters
+
+The various list operations will be piped through reporters. This means
+that e.g. XML reporter will write the output as machine-parseable XML,
+while the Console reporter will keep the current, human-oriented output.
+
+
+### `CHECKED_IF` and `CHECKED_ELSE`
+
+To make the `CHECKED_IF` and `CHECKED_ELSE` macros more useful, they will
+be marked as "OK to fail" (`Catch::ResultDisposition::SuppressFail` flag
+will be added), which means that their failure will not fail the test,
+making the `else` actually useful.
+
+
+### Change semantics of `[.]` and tag exclusion
+
+Currently, given these 2 tests
+```cpp
+TEST_CASE("A", "[.][foo]") {}
+TEST_CASE("B", "[.][bar]") {}
+```
+specifying `[foo]` as the testspec will run test "A" and specifying
+`~[foo]` will run test "B", even though it is hidden. Also, specifying
+`~[baz]` will run both tests. This behaviour is often surprising and will
+be changed so that hidden tests are included in a run only if they
+positively match a testspec.
 
 
 ---