Fix hscroll of R2L lines that begin with a TAB or another wide glyph.
src/xdisp.c (append_stretch_glyph): In a R2L glyph row, decrease the pixel width of the first glyph that is hscrolled from display. (display_line): In R2L glyph rows, don't give a negative offset to row->x when the first glyph begins before first_visible_x.
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