Upstream 4.2.4 was released with the following changes:
New features, changes and fixes in gnuplot version 4.2.4
===========================================================
* NEW add support for enhanced text mode in the emf terminal driver
* NEW builtin functions 'strftime' and 'strptime'
* NEW set absolute plot margins in screen coordinates
* NEW "nocontours" keyword for splot
* NEW "undefine foo" clears previously defined user variable foo
* NEW allow contouring of pm3d surfaces
* NEW allow color by z value ("palette z") in 2D plots
* NEW "pause mouse close" waits until the plot window is closed
* FIX Do not re-quantize time tics interval explicitly set by user
* FIX (gd post) don't segfault on very long font names
* FIX allow variable color from input file for "with boxes", "with vectors"
* FIX don't run off the end of "set format" commands
* FIX Fix discontinuity in piecewise approximation of inverse error function
* FIX discard out of range vectors in the bitmap terminals (pbm, epson, etc)
* FIX 2nd colour in the colour box for negative palette in postscript
* FIX insure palette is initialized before any objects are drawn
* FIX wxt terminal was not obeying "set palette maxcolors"
* FIX Histograms did not correctly honor 'set style user increment'
* FIX Avoid segfault if tic labels are requested from a non-existent data column
* FIX emf terminal - allow fractional linewidth (fixes 0-length dash problem)
* FIX post terminal - fix parsing error for palfuncparam
* FIX post terminal - escape {} chars in enhanced text mode
* FIX clip "splot with labels" against plot boundaries in 2D mode
* CHANGE try harder to autotitle columns in using specs with expressions
* CHANGE gd.trm: use dynamically-allocated TTF font names
* CHANGE x11: more finely sampled color palette for PM3D
* CHANGE cgm: switch to using web_color_rgbs; approximate RGB colors
* CHANGE fig: more point types, 4.2-style font and size syntax for "set term"
* CHANGE emf: separate dashlength option (don't use linewidth for dashlength)
* CHANGE stacked histograms grow upward for values > 0, downward for values < 0
* CHANGE 'pause mouse button1' (or button2) does not disable zooming
* CHANGE built-in readline tries to recognize <home> and <end> keys
--
Please sync gnuplot 4.2.3-1 (universe) from Debian unstable (main).
https://bugs.launchpad.net/bugs/250020
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