[code] Fixed Script edition cursor bugs.

The scroll is now reloaded when text is inserted or a new line is
entered. When opening a script, the cursor moves to the end of the
script.

Change-Id: I027ea80db485916fc3fc962cfa9e032ca0bbc81e

apps/code/editor_controller.cpp

@@ -29,6 +29,10 @@ void EditorController::didBecomeFirstResponder() {
   app()->setFirstResponder(&m_textArea);
 }
 
+void EditorController::viewWillAppear() {
+  m_textArea.moveCursor(strlen(m_textArea.text() - m_textArea.cursorLocation()));
+}
+
 void EditorController::viewDidDisappear() {
   m_scriptParameterController->scriptContentEditionDidFinish();
 }

apps/code/editor_controller.h

@@ -17,6 +17,7 @@ public:
   View * view() override { return &m_textArea; }
   bool handleEvent(Ion::Events::Event event) override;
   void didBecomeFirstResponder() override;
+  void viewWillAppear() override;
   void viewDidDisappear() override;
   ViewController::DisplayParameter displayParameter() override { return ViewController::DisplayParameter::WantsMaximumSpace; }
 

escher/src/text_area.cpp

@@ -334,7 +334,6 @@ Toolbox * TextArea::toolbox() {
 
 bool TextArea::handleEvent(Ion::Events::Event event) {
   if (m_delegate != nullptr && m_delegate->textAreaDidReceiveEvent(this, event)) {
-    return true;
   } else if (Responder::handleEvent(event)) {
     // The only event Responder handles is 'Toolbox' displaying.
     return true;
@@ -386,4 +385,5 @@ void TextArea::moveCursor(int deltaX) {
   for (int i = 0; i < numberSteps; i++) {
     m_contentView.moveCursorIndex(sign);
   }
+  scrollToContentRect(m_contentView.cursorRect(), true);
 }