Latest development version, linux Mint/Cinnamon, WXT version 3.0.0-2.
Here is the result of a dragging the lower right corner of a WXT plot to resize. Resizing works for a while but when the scale is about half the original size, gnuplot segfaults:
gnuplot> set term wxt Terminal type set to 'wxt' Options are '0 enhanced' gnuplot> plot sin(x) gnuplot> *** Error in `gnuplot': double free or corruption (fasttop): 0x0000000001435cd0 *** Aborted
Here is going back to 01/01/16
gnuplot> set term wxt Terminal type set to 'wxt' Options are '0 enhanced' gnuplot> plot sin(x) gnuplot> ** Gdk:ERROR:/build/gtk+2.0-3ongxb/gtk+2.0-2.24.23/gdk/gdkregion-generic.c:337:miSetExtents: assertion failed: (pExtents->y1 < pExtents->y2) Aborted
I've gone back further in time, but at some point it no longer compiles, so I'm assuming this is a Qt5 issue that has never been worked out.