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-- This method is for setting the status line hint
-- If s is Void the hint text will be cleared
-- This function is necessary to set custom progress cell
-- We may add a cell to the status line
-- We may add a cell to the status line
-- We can retrive the number of cells in status line
-- The first cell is hint.
-- This method give a simple way to indicate the
-- 'in_progress' (working) state of applicatoin.
-- After calling it, status line will be set
-- to the single bar with string "s" and percent
-- mark "0%". The cursor pointer will be set to
-- the 'busy' (ussually hourglass) shape.
--
-- The second parameter is the maximum value for
-- calculating the percentage (see 'update_indicator')
-- While your application is busy, it may show
-- the "is done" state by calling this method
-- with the value inside (0 ..limit). The
-- correct value of percent will be displayed.
-- If the value exceed the limit the "100%" bar
-- will be displayed.
-- We may restore the normal statusline state
-- The cursor pointer will be restored to the
-- previous shape.
--
-- NB: Restoring cursor is not implemented yet (STH)
-- This method perform all painting for status line
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