A plugin to streamline the introduction of copy-paste bugs.
Adds to usual double-click selection:

• Shift+Double-click: includes additional characters to selection
• Shift+Triple-click: "expression selection" (useful for selecting function call with arguments)
  

Plugin has options in the config file, call menu item
"Options / Settings-plugins / Extended Selection":

• "include_chars": additional characters to include in Shift+double-click selection
• "stop_ext": characters to stop Shift+triple-click selection when not enclosed in ()[]{}<>
• "open_chars" and "close_chars": map of opening-to-closing and closing-to-opening brackets. Used to limit selection extension to stay within brackets. And to ignore "stop_ext" characters inside brackets, when they follow selected text.

For example when cc clicked in following line:
aa = bb.cc<dd>(ee=ff) = ww

• normal double-click will yield selection:
  cc
• addon's shift+double-click:
  bb.cc

  (period and adjacent text is added to selection because '.' is in the "include_chars" for this lexer)

• addon's shift+triple-click:
  bb.cc<dd>(ee=ff)

  (selection stops at equal-signs at both sides because '=' is in the "stop_ext" for this lexer. "stop_ext" characters ('=' here) are ignored inside brackets)