Fix #337 - Array/Matrix trim trailing empty line (#479)

src/environments.js

@@ -96,6 +96,14 @@ function parseArray(
         if (next === "&") {
             parser.consume();
         } else if (next === "\\end") {
+            // Arrays terminate newlines with `\crcr` which consumes a `\cr` if
+            // the last line is empty.
+            const lastRow = body[body.length - 1][0].value;
+            if (body.length > 1
+                && lastRow.value.length === 1
+                && lastRow.value[0].value.length === 0) {
+                body.pop();
+            }
             break;
         } else if (next === "\\\\" || next === "\\cr") {
             const cr = parser.parseFunction();

test/screenshotter/ss_data.yaml

@@ -38,6 +38,11 @@ ArrayMode:
         \end{matrix}
     display: 1
 ArrayType: 1\begin{array}{c}2\\3\end{array}4
+ArrayRemoveEmptyLine: |
+    \begin{pmatrix}
+        1 \\
+        2 \\
+    \end{pmatrix}
 Baseline: a+b-c\cdot d/e
 BasicTest: a
 BinCancellation: |