Fix under accent depth (#2252)

* Fix under accent depth

* Update screenshots

src/functions/accentunder.js

@@ -37,8 +37,8 @@ defineFunction({
 
         // Generate the vlist, with the appropriate kerns
         const vlist = buildCommon.makeVList({
-            positionType: "bottom",
-            positionData: accentBody.height + kern,
+            positionType: "top",
+            positionData: innerGroup.height,
             children: [
                 {type: "elem", elem: accentBody, wrapperClasses: ["svg-align"]},
                 {type: "kern", size: kern},

test/screenshotter/ss_data.yaml

@@ -347,13 +347,13 @@ StackRel: a \stackrel{?}{=} b \stackrel{\text{def}}{=} c
 StretchyAccent: |
     \begin{array}{l}
         \overrightarrow{AB} \quad \overleftarrow{AB} \quad \Overrightarrow{AB} \quad \overleftrightarrow{AB} \quad \overgroup{AB} \\
-        \overlinesegment{AB} \quad \overleftharpoon{AB} \quad \overrightharpoon{AB} \quad \color{red}{\overrightarrow{AB}} \quad \widehat{\theta} \widetilde{A} \\
+        \overlinesegment{AB} \quad \overleftharpoon{AB} \quad \overrightharpoon{AB} \quad \left(\underleftarrow{\frac{value}{j}}\right)  \\
         \widecheck{AB} \quad \widehat{ABC} \quad \widetilde{AB} \quad \widetilde{ABC} \\
         \overrightarrow{F} + \overrightarrow{AB} + \overrightarrow{F}^2 + \overrightarrow{F}_2 + \overrightarrow{F}_1^2 \\
         \overrightarrow{AB}^2+\frac{\overrightarrow{AB}}{\overrightarrow{AB}} + \sqrt{\overrightarrow{AB}} + \left\lvert\overrightarrow{AB}\right\rvert
     \end{array}
 StretchyAccentColor: |
-    \red{\overrightarrow{AB}} \quad \color{blue}{\overleftarrow{AB}} \quad \color{blue}{\green{\Overrightarrow{AB}}}
+    \red{\overrightarrow{AB}} \quad \color{blue}{\overleftarrow{AB}} \quad \color{blue}{\green{\Overrightarrow{AB}}} \quad \widehat{\theta} \widetilde{A}
 StrikeThrough: |
     \begin{array}{l}
         \cancel x \quad \cancel{2B} + \bcancel 5 +\bcancel{5ay} \\