[escher] setEditing(true) when handling event in ScrollableEVWithCursor

Change-Id: I24760d7050fffd3ba5c38393450c4545354a7769

escher/src/scrollable_expression_view_with_cursor.cpp

@@ -52,6 +52,9 @@ bool ScrollableExpressionViewWithCursor::handleEvent(Ion::Events::Event event) {
     didHandleEvent = true;
   }
   if (didHandleEvent) {
+    if (!isEditing()) {
+      setEditing(true);
+    }
     reload();
     KDSize newSize = minimalSizeForOptimalDisplay();
     if (m_delegate && previousSize.height() != newSize.height()) {