Fix bug #17892 with mode/header line and display margins.
src/dispnew.c (prepare_desired_row): Accept 2 additional arguments: the window whose glyph row is being prepared and a flag whether it is for mode/header line. Make sure the glyph row's marginal areas are in sync with what the window wants. src/xdisp.c (display_line, display_mode_line): Call prepare_desired_row with additional arguments, as appropriate. src/dispextern.h (prepare_desired_row): Adjust prototype. src/window.h: Improve commentary of the marginal columns.
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