* generic/tkCanvas.c: allow -selectforeground option to be None; add

	* generic/tkCanvText.c:	fallback to fgColor when selFgColor is None
	* generic/tkEntry.c:	(new default on aqua to match native L&F).
	* generic/tkListbox.c:
	* generic/tkText.c:

	* generic/tkCanvas.c:	   add support for bypassing all of Tk's double
	* generic/tkEntry.c:	   buffered drawing into intermediate pixmaps
	* generic/tkFrame.c:	   (via TK_NO_DOUBLE_BUFFERING #define), it is
	* generic/tkListbox.c:	   unnecessary & wasteful on aqua where all
	* generic/tkPanedWindow.c: drawing is already double-buffered by the
	* generic/tkTextDisp.c:	   window server. (Use of this on other
	* generic/ttk/ttkWidget.c: platforms would only require implementation
	* unix/tkUnixScale.c:	   of TkpClipDrawableToRect()).

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