Replace Qt5 with Qt6 dependency and update to gnuplot 6.0.3

gnuplot.changes

@@ -1,3 +1,56 @@
+-------------------------------------------------------------------
+Wed Jun 11 08:02:18 UTC 2025 - Dr. Werner Fink <werner@suse.de>
+
+- Add patch gnuplot-6.0.3-backward_compat.patch 
+
+-------------------------------------------------------------------
+Wed Jun 11 06:45:38 UTC 2025 - Dr. Werner Fink <werner@suse.de>
+
+- Update to gnuplot 6.0.3
+  * NEW backport "contourfill {at base} {fs {no}border}"
+  * NEW backport "save changes <filename>"
+        This variant saves only the differences between the current
+        state and the state at the start of the session.
+  * NEW backport "plot <data> ... if (filter_condition)"
+        Input lines that satisfy the if condition are processed as usual.
+        Lines that fail are essentially ignored.
+  * NEW backport watchpoint label improvements from 6.1
+        Each watch target can have its own label, generated by a user function
+  * CHANGE 3D polygon objects can have per-object fill border properties.
+        The restriction that all 3D polygons share a single set of
+        properties from "set pm3d" remains true for "splot with polygons".
+  * CHANGE multiplot mousing and replot improvements back-ported from version 6.1
+  * CHANGE wxt: remove --with-wx-multithreaded configuration option
+  * CHANGE restrictions on watchpoint function target removed; any function is OK
+  * CHANGE "with hsteps" takes default width from "set boxwidth"
+  * CHANGE column(0) returns an integer (not complex) value
+  * FIX Support for combined hidden3d + pm3d depthorder back-ported from 6.1
+        This allows placing contours on a depth-sorted pm3d surface    Bug 2762
+  * FIX "with yerrorbars" error bar span should not affect OUTRANGE    Bug 2749
+  * FIX qt: opaque key caused incorrect interactive toggling           Bug 2761
+  * FIX 6.0.2 regression in "splot ... using 1:2:3:4 lc palette"       Bug 2784
+  * FIX placement of category labels along x-axis of boxplots          Bug 2789
+  * FIX qt, cairo: "set colorbox invert" produced empty colorbox
+  * FIX placement of minor tics along logscale axis with narrow range  Bug 2765
+  * FIX OK to have missing corners in an image from a sparse matrix    Bug 2791
+  * FIX error handling for various cases involving function blocks     Bug 2797
+- Remove patches now upstream
+  * fix4bug1240325.patch
+  * fix4bug1240326.patch
+  * fix4bug1240327.patch
+  * fix4bug1240328.patch
+  * fix4bug1240329.patch
+  * fix4bug1240330.patch
+
+-------------------------------------------------------------------
+Wed May 28 08:56:43 UTC 2025 - Antonio Larrosa <alarrosa@suse.com>
+
+- Build with qt6 instead of qt5
+- Add _constraints file to make sure there's enough disk space
+  for building
+- Use gcc-13 when building for Leap since qt6 needs a C++17
+  compiler
+
 -------------------------------------------------------------------
 Mon May 12 12:14:33 UTC 2025 - Dr. Werner Fink <werner@suse.de>