Fix multi-file diff parsing

apps/lib/diffwidget.cpp

@@ -333,6 +333,15 @@ void DiffWidget::parseAndShowDiff(const QByteArray &raw)
                 lineNumsA.append(-1);
                 lineNumsB.append(-1);
 
+                // add new line
+                left.append(QString());
+                right.append(QString());
+                lineA += 1;
+                lineB += 1;
+                break;
+            } else if (l.startsWith(QStringLiteral("diff --git "))) {
+                // Start of a new file
+                markInlineDiffs(hunkChangedLinesA, hunkChangedLinesB, leftHlts, rightHlts);
                 // add new line
                 left.append(QString());
                 right.append(QString());