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Emacs provides a general-purpose highlight mechanism which might work here. See Interactive Highlighting in the Emacs manual. The relevant commands are highlight-phrase or highlight-regexp to define what you want to highlight (and in what color). You can ask Hi Lock mode to save the highlight instructions in the file itself using hi-lock-write-interactive-...


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I know nothing about pdf-tools. But it sounds like you're just asking how to make Isearch's lazy highlighting persist after you stop searching. If so, the answer to that is to set user option lazy-highlight-cleanup to nil. C-h v tells you: lazy-highlight-cleanup is a variable defined in isearch.el. Its value is t Documentation: Controls ...


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As far as I can see, the problem is that enriched-face-ans does not consider inherited face attributes when it queries attributes with function face-attribute. It should call face-attribute with the INHERIT argument set to t. I assume that failing to do so is a bug in enriched-face-ans. Maybe, you should file a bug report to bug-gnu-emacs@gnu.org. There ...


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Library vline.el (vline.el) does what you're requesting. If you want the current column to be highlighted as you move around, then turn on vline-mode. (C-u turns it off.) Use vline-global-mode to do this everywhere. If you instead want a particular column to be highlighted and stay highlighted then use function (not command) vline-show. (Function vline-...


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