Clear all lines before selected

[janwilmans]

menu option to clear all lines before the selected line from the view.

[janwilmans]

Actually, today, working with a huge logfiles of 1.3 million lines, I really needed a 'clear lines before' and actually also a 'clear lines after' feature, so I could analyse just one part of the logfile.

also, I made the mistake of pressing Ctrl-x by accident, it would have been great to be able to 'reapply' the filters to the entire buffer. Maybe just expose the 'm_firstLine' in the filter dialog? then you can set it to any value (0 = reapply to buffer)

Alternatively, to could be a two-step process, add options to the right-click on a line context menu to:

• 'reset view' - to reappy the filters of a view to the entire buffer
• then 'reset to line' - to reset the m_firstline to the selected line

The 'clear after' option is cumbersome, it could work, but we would have to 'keep a list' of excluded ranges, or just remove the lines from the logfile entirely.