diff options
| -rw-r--r-- | lisp/term.el | 6 | ||||
| -rw-r--r-- | test/lisp/term-tests.el | 20 |
2 files changed, 22 insertions, 4 deletions
diff --git a/lisp/term.el b/lisp/term.el index 9aa4a20e36e..121a22e7933 100644 --- a/lisp/term.el +++ b/lisp/term.el @@ -3306,11 +3306,9 @@ option is enabled. See `term-set-goto-process-mark'." ((eq char ?B) (let ((tcr (term-current-row)) (scroll-amount (car params))) - (unless (= tcr (1- term-scroll-end)) + (unless (>= tcr term-scroll-end) (term-down - (if (> (+ tcr scroll-amount) term-scroll-end) - (- term-scroll-end 1 tcr) - (max 1 scroll-amount)) + (min (- term-scroll-end tcr) (max 1 scroll-amount)) t)))) ;; \E[C - cursor right (terminfo: cuf, cuf1) ((eq char ?C) diff --git a/test/lisp/term-tests.el b/test/lisp/term-tests.el index 72a9ad1ef74..ebf48d50a84 100644 --- a/test/lisp/term-tests.el +++ b/test/lisp/term-tests.el @@ -143,6 +143,26 @@ the first character of the line." (should (equal (term-test-screen-from-input width 12 strs) (make-string width ?_))))) +(ert-deftest term-to-margin () + "Test cursor movement at the scroll margin. +This is a reduced example from GNU nano's initial screen." + (let* ((width 10) + (x (make-string width ?x)) + (y (make-string width ?y))) + (should (equal (term-test-screen-from-input + width 3 + `("\e[1;3r" ; Setup 3 line scrolling region. + "\e[2;1H" ; Move to 2nd last line. + ,x ; Fill with 'x'. + "\r\e[1B" ; Next line. + ,y)) ; Fill with 'y'. + (concat "\n" x "\n" y))) + ;; Same idea, but moving upwards. + (should (equal (term-test-screen-from-input + width 3 + `("\e[1;3r" "\e[2;1H" ,x "\r\e[1A" ,y)) + (concat y "\n" x))))) + (provide 'term-tests) ;;; term-tests.el ends here |