https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119593
Bug ID: 119593
Summary: Format width is not correctly handled for unicode
characters
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: tkaminsk at gcc dot gnu.org
Target Milestone: ---
The following line, produce string with two '+' of padding.
std::format(L"{:+<3}", L'\U0001f921');
// https://godbolt.org/z/b9Mr73Pe5
However as the '\U0001f921' has estimated width 2, only one `+` should be
produced.
This only happens for wchar_t, as single char can represent code points in
ASCII range (<= 0x7f) that all have estimated width of 1.
