[plotter] close only at the end is several run are plot on same fig

plotter.py

@@ -299,7 +299,6 @@ class Plotter(Aggregator, BaseProcessor):
 
         datafiles = []
 
-        # Several plots
         if rule.kind == "snapshot" or rule.kind == "cells":
             run_num = [(run, num) for run in runs for num in nums[run]]
         elif rule.kind == "comp":
@@ -307,8 +306,15 @@ class Plotter(Aggregator, BaseProcessor):
         else:
             run_num = [(run, None) for run in runs]
 
+        onefigure = False  # If axes are provided, only save/close once
+        if ax is not None:
+            onefigure = True
+            plot_filename = self._find_filename(name_full)
+
         for i, (run, num) in enumerate(run_num):
+
             # Find filename
+            if not onefigure:
                 plot_filename = self._find_filename(name_full, run, num)
 
             # Find ax
@@ -335,6 +341,7 @@ class Plotter(Aggregator, BaseProcessor):
 
             # Call plot routine
             try:
+                close = (not onefigure) or (i == len(run_num) - 1)
                 plot_info = self._plot_rule(
                     rule,
                     save,
@@ -342,6 +349,7 @@ class Plotter(Aggregator, BaseProcessor):
                     plot_filename,
                     overwrite,
                     ax=real_ax,
+                    close=close,
                     run=run,
                     **kwargs,
                 )
@@ -367,7 +375,9 @@ class Plotter(Aggregator, BaseProcessor):
             datafiles.append(df)
         return datafiles
 
-    def _plot_rule(self, rule, save, arg, plot_filename, overwrite, ax, **kwargs):
+    def _plot_rule(
+        self, rule, save, arg, plot_filename, overwrite, ax, close=True, **kwargs
+    ):
         """
         Once all dependencies are met, actually process the rule
         """
@@ -375,10 +385,10 @@ class Plotter(Aggregator, BaseProcessor):
         if self._needs_computation(overwrite, plot_filename):
             plot_info = rule.plot(save, arg, **kwargs)
 
-            if not self.pp_params.out.interactive:
+            if not self.pp_params.out.interactive and close:
                 plt.tight_layout(pad=1)
 
-            if self.pp_params.out.save:
+            if self.pp_params.out.save and close:
                 plt.savefig(plot_filename)
                 self._log("{} plotted".format(plot_filename), "SUCCESS")
             else:
@@ -386,7 +396,7 @@ class Plotter(Aggregator, BaseProcessor):
                     "{} plotted".format(os.path.basename(plot_filename)), "SUCCESS"
                 )
 
-            if not self.pp_params.out.interactive:
+            if not self.pp_params.out.interactive and close:
                 plt.close()
             return plot_info
         else: