…idation within AdjustCursorPosition routine in the subsection about scrolling down at the bottom with a set of margins enabled.

…g to ETW. Change the scroll member variable to a til::point and math that directly (and add the operators and related tests to til::point).

(cherry picked from commit d972b5e)

…migrie/b/5113-with-miniksas-fix

# Conflicts:
#	src/renderer/vt/XtermEngine.cpp
#	src/renderer/vt/invalidate.cpp

  The test fails validating the second wrapped terminal line.

  I think the problem comes from us manually placing the cursor on the last line
  of the buffer. When we write the next 20 'A's, the first one gets written on
  the last cell of the first row, and that's bad.

  I'm going to see if I can't get rid of that call (the MoveCursor in
  PaintCursor) for this case. That seems like the cause of all this mess.

    TODO: This proves that the scrolling during a frame with other text
    breaks this scenario. We're going to try and special-case the scrolling
    thing to _only_ when
    * the invalid area is the bottom line, and
    * the line wrapped
    So in that case, we'll be sure that the next text will cause us to move
    the viewport down a line appropriately
    I've got a crazy theory that rendering bottom-up _might_ fix this

…ith-miniksas-fix

# Conflicts:
#	src/cascadia/UnitTests_TerminalCore/ConptyRoundtripTests.cpp
#	src/host/ut_host/ConptyOutputTests.cpp
#	src/renderer/vt/XtermEngine.cpp
#	src/renderer/vt/math.cpp

  It was unhappy with the exact line lengths and this change

…ro, so I'm stashing this.

  re: #5161

…s the minimal repro

…-with-miniksas-fix

…ith-miniksas-fix