The start and end lines of the scroll region must to be in the range
[0,term-height). There are few placees that incorrectly set the end
line of the scroll region to term-height which is outside the valid
range. Combined with another off-by-one error in
term-set-scroll-region's clamping logic, this would cause
term-scroll-with-delete to be unnecessarily turned on.
* lisp/term.el (term-scroll-start,term-scroll-end): Use defvar-local
to define the variables and document the valid range of values that
the variables can take.
(term--last-line): New function to calculate the 0-based index of the
last line.
(term--reset-scroll-region): New function to reset the scroll region
to the full height of the terminal.
(term-mode,term-reset-size,term-reset-terminal): Call
term--reset-scroll-region to reset the scroll region.
(term-set-scroll-region): Fix the off-by-one error in the clamping
logic which allowed term-scroll-end to have values outside the valid
range [0,term-height).
* lisp/term.el (term-emulate-terminal): Leave line-wrapping state if
point was moved after we entered it.
* test/lisp/term-tests.el (term-line-wrapping-then-motion): New test.
* test/lisp/term-tests.el (term-test-screen-from-input): Just unset
the process query-on-exit flag to rather than trying to end the
process before the end of test (which is generally unreliable).
* lisp/term.el (term-mode): Add `name' attribute to
window-adjust-process-window-size-function value, so that it can be
removed easily by tests.
* test/lisp/term-tests.el: New tests.
