reduce cap_height in textstyle and pad top of fraction

tfpf · tfpf · commit 2d070d009a62 · 2021-07-26T01:18:05.000+05:30
diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
@@ -2762,7 +2762,8 @@ def _genfrac(self, ldelim, rdelim, rule, style, num, den):
         if style is not self._MathStyle.DISPLAYSTYLE:
             num.shrink()
             den.shrink()
-            min_clearance = 0.5 * thickness
+            min_clearance = np.ceil(0.5 * thickness)
+            cap_height *= 0.7
         else:
             min_clearance = 1.5 * thickness
         cnum = HCentered([num])
@@ -2771,18 +2772,20 @@ def _genfrac(self, ldelim, rdelim, rule, style, num, den):
         cnum.hpack(width, 'exactly')
         cden.hpack(width, 'exactly')
 
-        if cnum.height < cap_height:
-            cnum.height = cap_height
         numerator_padding = max(
             3/5 * cap_height - cnum.depth, min_clearance) - thickness
         denominator_padding = max(
             4/3 * cap_height - cden.height, min_clearance) + thickness
-        vlist = Vlist([cnum,                         # numerator
-                       Vbox(0, numerator_padding),   # space
-                       Hrule(state, rule),           # rule
-                       Vbox(0, denominator_padding), # space
-                       cden                          # denominator
-                       ])
+        vlist_builder = []
+        if cnum.height < cap_height:
+            vlist_builder.append(Vbox(0, cap_height - cnum.height))
+        vlist_builder += [cnum,                          # numerator
+                          Vbox(0, numerator_padding),    # space
+                          Hrule(state, rule),            # rule
+                          Vbox(0, denominator_padding),  # space
+                          cden                           # denominator
+                          ]
+        vlist = Vlist(vlist_builder)
 
         # Shift so the fraction line sits in the middle of the
         # minus sign
