zim-plugin: lines_arrange.py custom-tools: reduce_blanks.py
This plugin arranges selected lines by functions:
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to indent (and strip space charaters at the right and the left of) each line with the same indent level as the first selected line;
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to delete all blank lines of the selected lines;
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to reduce all continous blank lines selected into only one.
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to sort lines in alphabetical order, if the list is already sorted the order will be reversed (like 'Line Sorter' plugin);