Refresh lineStatus when tab gets focus

Fixes #9138

Author: facchinm

app/src/processing/app/Editor.java

@@ -80,6 +80,8 @@
 import javax.swing.event.MenuEvent;
 import javax.swing.event.MenuListener;
 import javax.swing.text.BadLocationException;
+import javax.swing.text.Document;
+import javax.swing.text.Element;
 
 import org.fife.ui.rsyntaxtextarea.folding.FoldManager;
 

app/src/processing/app/EditorTab.java

@@ -30,7 +30,8 @@
 import java.awt.Font;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
-
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
 import java.io.IOException;
 
 import javax.swing.Action;
@@ -175,6 +176,15 @@ private SketchTextArea createTextArea(RSyntaxDocument document)
 
       editor.lineStatus.set(lineStart, lineEnd);
     });
+    textArea.addFocusListener(new FocusListener() {
+      public void focusGained(FocusEvent e) {
+        Element root = textArea.getDocument().getDefaultRootElement();
+        int lineStart = root.getElementIndex(textArea.getCaret().getMark());
+        int lineEnd = root.getElementIndex(textArea.getCaret().getDot());
+        editor.lineStatus.set(lineStart, lineEnd);
+      };
+      public void focusLost(FocusEvent e) {};
+    });
     ToolTipManager.sharedInstance().registerComponent(textArea);
 
     configurePopupMenu(textArea);