Include reruns in -ra/-rA short test summary

[LouisDeconinck]

Summary

• -ra/-rA ("all") now shows the rerun test summary info section, without requiring -rR
• pytest expands the a/A reportchars before they reach the terminal reporter, so the plugin now checks the raw -r option for a/A in addition to the explicit r/R

Closes #45

Test plan

• Added parametrized test covering -ra and -rA producing the rerun summary section
• Existing -rR summary tests still pass

[icemac]

Reading the raw -r option bypasses pytest's N reset, so the rerun summary now escapes a reset that used to suppress it.

getreportopt() treats N as "reset the list": for -raN it first expands a and then clears everything, leaving reportopts == "". Since this check only scans the raw string for any of rRaA, the a still matches and the section is printed.

Confirmed against pytest 9.1.1 with a flaky test and --reruns 1:

flags	master	this PR
-raN	no section	section printed
-ra	no section	section printed (intended)

Honouring only the part after the last N matches pytest's own semantics, and keeping tr.reportchars in the check preserves the explicit R path (plus anything that appends to reportchars at runtime). Full suite (252 tests) passes with this, -raN goes back to printing nothing, and -rNa still prints — consistent with pytest, which reports after a reset too.

Suggested change

	# -rR selects reruns explicitly; -ra/-rA ("all") should include them too,
	# but pytest expands those flags before tr.reportchars is set, so check the
	# raw option instead.
	requested = tr.config.option.reportchars
	if not show_tracebacks and not any(c in "rRaA" for c in requested):
	# -rR selects reruns explicitly; -ra/-rA ("all") should include them too,
	# but pytest expands those flags before tr.reportchars is set, so check the
	# raw option as well. "N" resets the list, so only honour what follows the
	# last reset.
	requested = tr.reportchars + tr.config.option.reportchars.rsplit("N", 1)[-1]
	if not show_tracebacks and not any(c in "rRaA" for c in requested):

— Comment created by Claude