Improve mouse dragging of frame edges.
* keyboard.c (make_lispy_position): Return coordinates also when on scroll bars, fringes, margins or not in a window. * xdisp.c (show_mouse_face): Don't change cursor face during mouse tracking. * mouse.el (mouse-drag-line): Don't use mouse-pixel-position. Calculate increment from last position instead of window edge. Add right- and bottom-divider bindings to transient map.
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