Don't block changes in mouse pointer inside 'track-mouse'
* etc/NEWS: * doc/lispref/frames.texi (Mouse Tracking): Document the special effect of setting 'track-mouse' to 'dragging'. * lisp/textmodes/artist.el (artist-mouse-draw-continously): * lisp/ruler-mode.el (ruler-mode-mouse-drag-any-column-iteration): * lisp/mouse-drag.el (mouse-drag-throw): * lisp/mouse.el (mouse-drag-line): Set 'track-mouse' to 'dragging' to avoid changes in the shape of the mouse pointer. * src/xdisp.c (define_frame_cursor1): Don't change the mouse pointer shape when do_mouse_tracking has the value of 'dragging', not just any non-nil value. (Bug#20934) (syms_of_xdisp): DEFSYM 'dragging'.
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