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org-drill--setup-display saved buffer-local state (mode-line,
variable-pitch-mode) into global defvars and called setq-local on
the current buffer. org-drill--restore-display read those globals
and ran setq-local against whatever buffer happened to be current
at restore time.
If the user switched buffers mid-session, the restore wrote to the
wrong buffer — leaving the original drill buffer's mode-line still
hidden and trampling the destination buffer's mode-line with
whatever was saved from elsewhere.
Captured the buffer at setup in org-drill--saved-display-buffer.
Restore now wraps mode-line and variable-pitch restoration in
with-current-buffer against that saved buffer. Text-scale stays
global (the underlying face attribute is process-wide).
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