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Issue #44 (2021): running org-drill in a TTY emacsclient (the
reporter mentioned tmux) raised "Window system frame should be
used" because LaTeX preview helpers (org-latex-preview,
org--latex-preview-region) require a window system and weren't
guarded.
Wrapped both call sites with (when (display-graphic-p) ...).
- org-drill--show-latex-fragments: now a silent no-op on TTY
- present-default-answer's clear-and-preview block: same guard
LaTeX previews are inherently graphical. The right behavior on
TTY is to skip the preview rather than crash the session — TTY
users still see the underlying source text just fine.
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