fix: set correct bg colour for trailing line whitespaces #73
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Fixes issue: #72
Trailing whitespaces aren't coloured correctly when inserted inside of
render_line
:render_line
inserts empty whitespace characters after rendering the last token that is available.render_slice
that is used for rendering individual tokens finishes by inserting "[m" ASCII escape sequence which resets all previously set style options including background colour.So in order to properly insert trailing whitespace we must specify a background colour ASCII escape sequence before that.