Completed function fix (order of subplot input does not matter, need clarification if it matters)

Author: eicchen

pandas/plotting/_matplotlib/core.py

@@ -1928,6 +1928,19 @@ def _make_plot(self, fig: Figure) -> None:
         K = self.nseries
 
         data = self.data.fillna(0)
+
+        _stacked_subplots_ind_dict  = {}
+        _stacked_subplots_offsets   = []
+
+        if self.subplots != False & self.stacked:
+            # _stacked_subplots_list = [sorted(x) for x in self.subplots if len(x) > 1]
+            temp_ss_dict = {x: self.subplots[x] for x in range(len(self.subplots)) if len(self.subplots[x]) > 1}
+            for k, v in temp_ss_dict.items():
+                for x in v:
+                    _stacked_subplots_ind_dict.setdefault(int(x), k)
+                    
+                _stacked_subplots_offsets.append([0,0])
+
         for i, (label, y) in enumerate(self._iter_data(data=data)):
             ax = self._get_ax(i)
             kwds = self.kwds.copy()
@@ -1953,7 +1966,33 @@ def _make_plot(self, fig: Figure) -> None:
             start = start + self._start_base
 
             kwds["align"] = self._align
-            if self.subplots:
+            
+            try:
+                offset_index = _stacked_subplots_ind_dict[i]
+                _stacked_subplots_flag = 1
+            except:
+                _stacked_subplots_flag = 0
+
+            if _stacked_subplots_flag:
+                mask = y >= 0
+                pos_prior, neg_prior = _stacked_subplots_offsets[offset_index]
+                start = np.where(mask, pos_prior, neg_prior) + self._start_base
+                w = self.bar_width / 2
+                rect = self._plot(
+                    ax,
+                    self.ax_pos + w,
+                    y,
+                    self.bar_width,
+                    start=start,
+                    label=label,
+                    log=self.log,
+                    **kwds,
+                )
+                pos_new = pos_prior + np.where(mask, y, 0)
+                neg_new = neg_prior + np.where(mask, 0, y)
+                _stacked_subplots_offsets[offset_index] = [pos_new, neg_new]
+                
+            elif self.subplots:
                 w = self.bar_width / 2
                 rect = self._plot(
                     ax,