v2.19: \time change under \alternative triggers bug

[Rutger Hofman]

Good evening list,

v2.19.0 has a new bug compared to v2.17 and v2.18 in the following 
snippet, from the \time change in the second \alternative:

\score {
    \new Staff {
        \relative c'' {
            \time 4/4
            \repeat volta 2 {
                c1 |
            }
            \alternative {
                { c1 | }
                { \time 6/4 c4 c4 c2 c2 | }
            }
            c2 c2 c2 |
        }
    }
}

v2.18 compiles and generates correctly.
v2.19.0 generates a barcheck error:

alternate-key-change.ly:13:22: warning: barcheck failed at: 1/2
            c2 c2 c2

and generates output that corresponds to the idea that the \time is 
still 4/4 after the alternatives. I attach pngs for both.

Rutger Hofman
Amsterdam

alternate-key-change-v2.18.png
Description: PNG image

alternate-key-change-v2.19.png
Description: PNG image