TclTkIp#_eval calls Tcl_Eval() on the mainloop thread only
(queueing a handler to the EventQueue).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4921 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
to fix the pthread trouble on 'tcltklib'
ext/tcltklib/README.1st: add the description of '--with-pthread-ext'
ext/tk/lib/tktext.rb : add TkText#text_copy, text_cut, text_paste to
support Tcl/Tk8.4's tk_textCopy, tk_textCut, tk_textPaste
ext/tk/lib/tk.rb : add TkMenu#set_focus support Tcl/Tk's tk_menuSetFocus
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4904 b2dd03c8-39d4-4d8f-98ff-823fe69b080e