Cleanup of window coordinate positioning code.
Now, text area click input events measure Y from the top of the text area, excluding the header line if any. * src/dispnew.c (buffer_posn_from_coords): Assume that X counts from the start of the text area. * src/keyboard.c (make_lispy_position): For text area clicks, record Y pixel position relative to the text area, excluding header line. Also change X and Y to Lisp_Objects, not pointers; don't return coordinate values via pointers. Pass ON_TEXT_AREA coordinate to buffer_posn_from_coords counting from the start of the text area. (Fposn_at_x_y, make_lispy_event): Callers changed. * src/w32term.c (w32_read_socket): * src/msdos.c (dos_rawgetc): * src/xterm.c (handle_one_xevent): Likewise. * src/window.c (coordinates_in_window): Change X and Y to ints rather than pointers; don't return coordinates via pointers. (struct check_window_data): Change X and Y from pointers to ints. (window_from_coordinates): Remove args WX and WY; don't return coordinates via pointers. (Fcoordinates_in_window_p, window_from_coordinates): (check_window_containing, Fwindow_at): Callers changed. (window_relative_x_coord): New function. * src/window.h (window_from_coordinates, window_relative_x_coord): Update prototypes. * src/xdisp.c (remember_mouse_glyph): Change window_from_coordinates call. Use window_relative_x_coord. (note_mouse_highlight): Change window_from_coordinates call.
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