Broken TUI lines in Gentoo Linux

[honggyukim]

In Gentoo Linux, TUI output looks as follows:

  TOTAL TIME : FUNCTION
    5.784 us : (1) t-abc
    1.702 us :   ~T~\ ~T~@(1) __monstartup
             :   ~T~B
    0.910 us :   ~T~\ ~T~@(1) __cxa_atexit
             :   ~T~B
    3.172 us :   ~T~T ~T~@(1) main
    2.772 us :    (1) a
    2.417 us :    (1) b
    1.952 us :    (1) c
    0.832 us :    (1) getpid

It uses libncursesw.so.6 as follows:

$ ldd uftrace
        ...
    libncursesw.so.6 => /lib64/libncursesw.so.6 (0x00007f2d3be03000)
        ...

[honggyukim]

If we can detect if the line cannot be printed correctly, it'd be better to fall back to using normal characters.

[honggyukim]

The lines in tig program looks fine, so it may be our problem not related to the library installed in system.