f069b975fb
Change LaTeX implementation of `@title` to just use `\title` --- don't try to extract a subtitle.
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This fixes a bug, where the `Title` meta-data in the PDF for a document titled
"Foo" was "oo" (same title with first letter missing). So, e.g., Google chrome
would show "oo" as the tab title for the document.
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Why not try to fix subtitle extraction?
1. I don't think we need it in `scribble/acmart`, because there's a separate `@subtitle` command
2. Not sure how to extract a subtitle without using `\let` inside `\title`, but doing so generates 2 LaTeX warnings:
```
Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):
(hyperref) removing `\<let>-command' on input line 674.
Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):
(hyperref) removing `\SSubtitle' on input line 674.
```
The "visual" bug was probably due to this warning; after removing the `\let`
and `\SSubtitle` then only `\SubtitleDrop` and the actual title are left.
I guess `\SSubtitleDrop` removed the first character of the title.
(Why only the first character? I don't know.)
The LaTeX warning from `hyperref` is probably because acmart expects the
argument to `\title` to be a raw string. Though, the docs don't explicitly
say this. They only say "It is expected that this command [`\title`] is inserted
by the author of the manuscript."
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