/usr/include/KF5/KPIMTextEdit/KPIMTextEdit/RichTextComposerEmailQuoteHighlighter is in libkf5pimtextedit-dev 15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | #include "kpimtextedit/richtextcomposeremailquotehighlighter.h"
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