Serial monitor: input textfield is automatically selected

When the serial monitor window is focused again (not reopened but put
in background and selected again) the text input field is now
automatically focused.

Fix arduino#5810

Author: cmaglie

app/src/processing/app/AbstractTextMonitor.java

@@ -8,6 +8,8 @@
 import java.awt.Font;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
 
 import javax.swing.Box;
 import javax.swing.BoxLayout;
@@ -66,6 +68,13 @@ protected void onCreateWindow(Container mainPane) {
     upperPane.setBorder(new EmptyBorder(4, 4, 4, 4));
 
     textField = new JTextField(40);
+    // textField is selected every time the window is focused
+    addWindowFocusListener(new WindowAdapter() {
+      public void windowGainedFocus(WindowEvent e) {
+        textField.requestFocusInWindow();
+      }
+    });
+
     sendButton = new JButton(tr("Send"));
 
     upperPane.add(textField);

build/shared/revisions.txt

@@ -4,6 +4,7 @@ ARDUINO 1.8.2
 * Fix command line: works again with relative paths (regression)
 * Update arduino-builder to 1.3.24 to avoid name clashing for libraries
 * Allow BoardManager to fetch FreeBSD tools (thanks @kevans91)
+* Serial monitor: the input string box is automatically focused when window is selected
 
 [core]
 * Add Atmel-ICE and JTAGICE3 programmers for AVR chips (thanks @matthijskooijman)