grass.script: ensure memmap content is flushed before writing to a raster (#3206)

Author: petrasovaa

python/grass/script/array.py

@@ -210,6 +210,9 @@ def write(self, mapname, title=None, null=None, overwrite=None, quiet=None):
         else:
             raise ValueError(_("Invalid kind <%s>") % kind)
 
+        # ensure all array content is written to the file
+        self.flush()
+
         reg = gcore.region(env=self._env)
 
         try:
@@ -315,6 +318,9 @@ def write(self, mapname, null=None, overwrite=None, quiet=None):
         else:
             raise ValueError(_("Invalid kind <%s>") % kind)
 
+        # ensure all array content is written to the file
+        self.flush()
+
         reg = gcore.region(True, env=self._env)
 
         try: