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Once code has scrolled off the top of a window, it can be difficult to
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determine which block you are in. This extension implements a pane at the top
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of each IDLE edit window which provides block structure hints. These hints are
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the lines which contain the block opening keywords, e.g. 'if', for the
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enclosing block. The number of hint lines is determined by the numlines
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variable in the CodeContext section of config-extensions.def. Lines which do
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not open blocks are not shown in the context hints pane.
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If the line does not start a block, the keyword value is False.
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The indentation of empty lines (or comment lines) is INFINITY.
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Stop when stopline or stopindent is reached. Return a tuple of context
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data and the indent level at the top of the region inspected.
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<d S( sK Update context information and lines visible in the context pane.
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