Fix some NS drawing issues (bug#32932)
* src/nsterm.m (ns_clip_to_rect): (ns_reset_clipping): Remove gsaved variable and associated code. (ns_flush_display): Remove function. (ns_copy_bits): use translateRectsNeedingDisplayInRect:by: to copy any pending drawing actions along with the image. ([EmacsView windowWillResize:toSize:]): Remove unneeded call. ([EmacsView drawRect:]): Remove redundant call to ns_clear_frame_area, and optimize the exposed rectangles. (ns_draw_window_cursor): Remove unneeded disabling of screen updates.
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