more: add arguments print over and clean print

[Ideflop]

#2320

This pull request adds two arguments: -c, --print-over and -p, --clean-print.

I have included them in an if ... else if block because when both -c and -p are provided, it results in the --print-over options being applied.

[sylvestre]

The test is failing:

--- TRY 3 STDERR:        coreutils::tests test_more::test_valid_arg ---
thread 'test_more::test_valid_arg' panicked at 'Command was expected to succeed.
stdout = 
 stderr = thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 6, kind: Uncategorized, message: "No such device or address" }', src/uu/more/src/more.rs:223:33
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
', tests/by-util/test_more.rs:15:27
stack backtrace:
   0: rust_begin_unwind
             at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/std/src/panicking.rs:584:5
   1: core::panicking::panic_fmt
             at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/panicking.rs:142:14
   2: tests::common::util::CmdResult::success
             at ./tests/common/util.rs:390:9
   3: tests::common::util::UCommand::succeeds
             at ./tests/common/util.rs:1559:9
   4: tests::test_more::test_valid_arg
             at ./tests/by-util/test_more.rs:15:5
   5: tests::test_more::test_valid_arg::{{closure}}
             at ./tests/by-util/test_more.rs:14:1
   6: core::ops::function::FnOnce::call_once
             at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ops/function.rs:248:5
   7: core::ops::function::FnOnce::call_once
             at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ops/function.rs:248:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/tail-2/inotify-dir-recreate. tests/tail-2/inotify-dir-recreate is passing on 'main'. Maybe you have to rebase?

[cakebaker]

code_is(0) is not necessary, it's already implied by succeeds().

[cakebaker]

While more -c file.txt works fine, more -p file.txt doesn't seem to work correctly. When I start paging, the content of the previous page(s) is not cleared.

[Ideflop]

I have corrected the behavior of the two commands because they were not functioning properly previously.
The command -c mistakenly cleared both the displayed text and its history instead of just deleting the currently displayed text.
The command -p now works correctly by taking the displayed text and adding it to the history. As a result, the terminal is emptied, allowing the remaining content to be printed.

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/tail-2/inotify-dir-recreate is no longer failing!

[cakebaker]

Thanks for your PR :)