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Invisible bar line and wide lyric produces "mis-predicted force" error.

From: Aaron Hill
Subject: Invisible bar line and wide lyric produces "mis-predicted force" error.
Date: Wed, 18 Apr 2018 15:42:42 -0700
User-agent: Roundcube Webmail/1.3.3

I encountered this when typesetting a piece that needs fairly wide stanza markings. One piece worked fine, while another failed with "mis-predicted force" errors. While reducing the repro, it seemed the main difference was the presence of an invisible bar line (i.e. \bar "") earlier in the score along with some wide lyrics. Without that bar line present or by narrowing the stanza marking, the piece that had failed no longer reported any errors.

For reference, I am using version 2.19.80 (MinGW) on Windows 10 Pro 64-bit (16299.371).

Here is a minimal repro using a simple lyric instead of a stanza marking:

% The combination of an invisible bar line and a wide lyric produces:
% "programming error: mis-predicted force, 108.120472 ~= 108.482555"
\version "2.19.80"
{ r2 \bar "" c'2 } \addlyrics { "mmmmmm" }

The only references I could find to "mis-predicted force" are in relation to an issue regarding grace notes and possible floating-point arithmetic issues in the Windows/MinGW build. Presuming this is related, here is hoping this repro can help shed some light on the underlying issue.

-- Aaron Hill

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