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Once code has scrolled off the top of a window, it can be difficult to
determine which block you are in. This extension implements a pane at the top
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 numlines
variable in the CodeContext section of config-extensions.def. Lines which do
not open blocks are not shown in the context hints pane.
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c C s� | j j d | d | � } t | � \ } } | t k o> | } t | � t | � k so | t | � d k rx t } n t | � } | | | f S( s� Get the line indent value, text, and any block start keyword
If the line does not start a block, the keyword value is False.
The indentation of empty lines (or comment lines) is INFINITY.
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C s� | d k s t � g } t } x� t | | d d � D]� } | j | � \ } } } | | k r5 | } | d k r~ | d 7} n | r� | | k r� | | k r� | j | | | | f � n | | k r� Pq� q5 q5 W| j � | | f S( s� Get context lines, starting at new_topvisible and working backwards.
Stop when stopline or stopindent is reached. Return a tuple of context
data and the indent level at the top of the region inspected.
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