Some fixes for scroll bar code.
* w32term.c (w32_horizontal_scroll_bar_handle_click): In `event->y' return entire range (the size of the scroll bar minus that of the thumb). * xterm.c (xm_scroll_callback, xaw_jump_callback): In `whole' return entire range (the scaled size of the scroll bar minus that of the slider). In `portion' return the scaled position of the slider. (xaw_jump_callback): Restore part of code for vertical scroll bar broken in change from 2014-07-27. (xaw_scroll_callback): Provide incremental scrolling with horizontal scroll bars. (x_scroll_bar_handle_click): Fix typo introduced in change from 2014-07-27. * scroll-bar.el (scroll-bar-horizontal-drag-1): Handle new interpretation of `portion-whole'.
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