dashes again

[Petr M. <mi...@ph...>]

I raise questions about dash line patters from time to time (see e.g.
messages "unified dashes"). Usually it happens when I try to do
	set term x11 dash
	plot x,-x,1,2,3
and it comes out solid :-)

1. It did not work in the morning, I had to find an older e-mail and
   find there
         xrdb -merge < Gnuplot.app-defaults

1a. That seems to be a problem for ordinary users, because
   file  Gnuplot.app-defaults  is not "make install"ed.

1b. Further, gnuplot-x11 does not detect automatically that it cannot
   draw dash lines because that xrdb command was not executed. Why it
   does not help? It should write a warning when "gnuplot -dashed" or
   "set term x11 dash".

2. "dash" support was added into wxt terminal in June 2009, just after
   4.4 branch separation. Shouldn't this be (back)ported to 4.4?

3. Windows terminal supports solid, dash, dot-dash patterns via
   its menu in the graph window, but it does not support
      set term windows {solid|dashed}
   Benjamin, can you please implement it?

4. Should "all usual" terminals support both options
      {solid|dash} {dashlength <dl>}  ?
   Currently:
     x11, svg: {solid|dash}
     wxt, postscript: {dashed|solid} {dashlength <dl>}
     png, pdf: {dashlength <dl>}
and
      set termoption {solid|dashed}

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PM