fmt: allow padding and minus flags at the same time
Existing implementation did not allow setting both padding and minus flags at the same time because standard formatting does not allow that. But custom Formatter interface implementations might have use of it. This change moves the check from the place flags are parsed to where they are used in standard formatting.
Fixes #61784
Change-Id: If5909d45dc929ddf911453e1056a4661abe76e52
GitHub-Last-Rev:
d99ec55d3bbd9b2a8f14c8ade2fb25d6e0c174c3
GitHub-Pull-Request: golang/go#61836
Reviewed-on: https://go-review.googlesource.com/c/go/+/516975
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Martin Möhrmann <martin@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>