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Once code has scrolled off the top of a window, it can be difficult to
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of each IDLE edit window which provides block structure hints. These hints are
the lines which contain the block opening keywords, e.g. 'if', for the
enclosing block. The number of hint lines is determined by the maxlines
variable in the codecontext section of config-extensions.def. Lines which do
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editwin is the Editor window for the context block.
self.text is the editor window text widget.
self.textfont is the editor window font.
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Initially None, it is toggled via <<toggle-code-context>>.
self.topvisible is the number of the top text line displayed.
self.info is a list of (line number, indent level, line text,
block keyword) tuples for the block structure above topvisible.
self.info[0] is initialized with a 'dummy' line which
starts the toplevel 'block' of the module.
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