Regression from the original text widget.

text configure -wrap char (probably -wrap word also)

tests: textDisp-24.8, textDisp-24.9, et.al.

revised_text:
  When there is not enough room, a wrapped line with a space at the end always
  displays the space on the next line.
  "a b c" (wrap)
  " d e f"

8.6.6:
  When there is not enough room, a wrapped line with a space at the end does
  not display the space.
  "a b c " (wrap, the space is hidden)
  "d e f"

An improvement could be made:

When there are zero pixels available, both versions move the space to the next
line.  In this case, the space does not need to be displayed.
Have:
  "a b c"  (zero pixels available for next character)
  " d e f" (current display)
Want:
  "a b c " (space is hidden)
  "d e f"