Fix cursor drawing in hscrolled R2L screen lines.
src/xdisp.c (get_glyph_string_clip_rects): Don't let the width of a clipping rectangle become negative (i.e. large positive, since it's an unsigned data type). This can happen in R2L hscrolled glyph rows, and caused us to draw the cursor glyph on the fringe. For the details, see http://lists.gnu.org/archive/html/emacs-devel/2014-08/msg00543.html.
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