[Kst] [kst] [Bug 358002] Only plots Points. Lines missing

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=358002

--- Comment #4 from netterfield at astro.utoronto.ca ---
This is working as designed: 

Ascii files are 1 frame per line, so all fields are assumed to be at the same
sample rate.

The ascii reader config option allows for missing data to be interpreted as a
NaN, replaced with the previous value, or be interpreted as 0.

NaN represents a hole in the data, so no line is drawn to it.  If a data point
has NaNs on both sides of it, then there will be no line drawn to it.

We could consider adding the option to interpolate NaNs either in the ascii
reader or in the curve dialog.

Or we could consider adding the option to have a 'frame' be multiple lines,
allowing for variable numbers of samples per frame in ascii.

Alternatively, consider using a data source that natively handles variable
numbers of samples per frame (eg, dirfiles).

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