[RHEL6] The insertion cursor of the TextWidget has border line of the widget at the left end when XmNmarginWidth < 3.

Issue

• When the value of XmNmarginWidth of the TextWidget is less than 3, the insertion cursor area has extra border line of the widget.

• How reproducible:
  Always

• Steps to Reproduce:

  1. Create a TextWidget.
  2. Set XmNmarginWidth at the TextWidget to 2.
  3. Type some characters in the TextWidget.
  4. Move the insertion cursor of the TextWidget on both side of the first character.
     Here is a test program: https://bugzilla.redhat.com/attachment.cgi?id=564823 in bug 796014.

• Actual results:
  The left shadow border line of the TextWidget widens under the cursor.

• Expected results:
  Text insertion cursor brinks normally without any other influence.

• Additional info:
  Currently, there are 3 position calculation for:
  a) IBeamOffArea
  b) IBeam (blink on)
  c) IBeam (blink off)
  So, there are cases that positions of b) and c) are different from a).

• See the upstream bug report:
  http://bugs.motifzone.net/show_bug.cgi?id=1552