Fix cursor motion across display strings covering reordered text.
src/xdisp.c (set_cursor_from_row): Set start and stop points according to the row's direction when priming the loop that looks for the glyph on which to display cursor. (single_display_spec_intangible_p): Function deleted. (display_prop_intangible_p): Reimplement to call handle_display_spec instead of single_display_spec_intangible_p. Accept 3 additional arguments needed by handle_display_spec. This fixes incorrect cursor motion across display property with complex values: lists, `(when COND...)' forms, etc. (single_display_spec_string_p): Support property values that are lists with the argument STRING its top-level element. (display_prop_string_p): Fix the condition for processing a property that is a list to be consistent with handle_display_spec. src/keyboard.c (adjust_point_for_property): Adjust the call to display_prop_intangible_p to its new signature. src/dispextern.h (display_prop_intangible_p): Adjust prototype.
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