From 19afbe99d91be1445fae53513633f8a891b7dfb0 Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Mon, 17 Jul 2023 15:45:03 +0200
Subject: [PATCH] FormattedTextField: On Linux, fixed
 `IllegalArgumentException: Invalid location` if
 `JFormattedTextField.setDocument()` is invoked in a focus gained listener on
 that formatted text field. (issue #698)

---
 CHANGELOG.md                                              | 3 +++
 .../src/main/java/com/formdev/flatlaf/ui/FlatCaret.java   | 8 ++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4025a29f..c3a1f330 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,9 @@ FlatLaf Change Log
 - Native Windows libraries: Fixed crash when running in Java 8 and newer Java
   version is installed in `PATH` environment variable and using class
   `SystemInfo` before AWT initialization. (issue #673)
+- FormattedTextField: On Linux, fixed `IllegalArgumentException: Invalid
+  location` if `JFormattedTextField.setDocument()` is invoked in a focus gained
+  listener on that formatted text field. (issue #698)
 
 
 ## 3.1.1
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java
index 95c0ccc1..e301961e 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java
@@ -256,10 +256,14 @@ public class FlatCaret
 		// select all
 		if( c instanceof JFormattedTextField ) {
 			EventQueue.invokeLater( () -> {
-				if( getComponent() == null )
+				// Warning: do not use variables from outside of this runnable
+				//          because they may be out-of-date when this runnable is executed
+
+				JTextComponent c2 = getComponent();
+				if( c2 == null )
 					return; // was deinstalled
 
-				select( 0, doc.getLength() );
+				select( 0, c2.getDocument().getLength() );
 			} );
 		} else {
 			select( 0, doc.getLength() );