message: [terminal] Line: Fixes cellEmptyAt(pos) test on trivial buffer to not take whitespace cells into account.
diff: @@ -213,7 +213,8 @@ class Line
  {
  Require(ColumnOffset(0) <= column);
  Require(column < ColumnOffset::cast_from(size()));
  - return unbox<size_t>(column) >= trivialBuffer().text.size();
  + return unbox<size_t>(column) >= trivialBuffer().text.size()
  + || trivialBuffer().text[column.as<size_t>()] == 0x20;
  }
  return inflatedBuffer().at(unbox<size_t>(column)).empty();
  }
  