From eea6bf2ef88ecd477d6426a4fac9a7b668957675 Mon Sep 17 00:00:00 2001
From: BDisp <bd.bdisp@gmail.com>
Date: Thu, 5 Jan 2023 15:31:36 +0000
Subject: [PATCH] Fixes #2277. Changing TextField.Text does not clear text
 selection.

---
 Terminal.Gui/Views/TextField.cs |  1 +
 UnitTests/TextFieldTests.cs     | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/Terminal.Gui/Views/TextField.cs b/Terminal.Gui/Views/TextField.cs
index 8e843b22b..14fc56394 100644
--- a/Terminal.Gui/Views/TextField.cs
+++ b/Terminal.Gui/Views/TextField.cs
@@ -298,6 +298,7 @@ namespace Terminal.Gui {
 					}
 					return;
 				}
+				ClearAllSelection ();
 				text = TextModel.ToRunes (newText.NewText);
 
 				if (!Secret && !historyText.IsFromHistory) {
diff --git a/UnitTests/TextFieldTests.cs b/UnitTests/TextFieldTests.cs
index cc3559848..a931f72e0 100644
--- a/UnitTests/TextFieldTests.cs
+++ b/UnitTests/TextFieldTests.cs
@@ -1296,5 +1296,32 @@ namespace Terminal.Gui.Views {
 			Assert.Equal ($"{text}A", tf.Text);
 			Assert.True (tf.IsDirty);
 		}
+
+		[InlineData ("a")] // Lower than selection
+		[InlineData ("aaaaaaaaaaa")] // Greater than selection
+		[InlineData ("aaaa")] // Equal than selection
+		[Theory]
+		public void TestSetTextAndMoveCursorToEnd_WhenExistingSelection (string newText)
+		{
+			var tf = new TextField ();
+			tf.Text = "fish";
+			tf.CursorPosition = tf.Text.Length;
+
+			tf.ProcessKey (new KeyEvent (Key.CursorLeft, new KeyModifiers ()));
+
+			tf.ProcessKey (new KeyEvent (Key.CursorLeft | Key.ShiftMask, new KeyModifiers { Shift = true }));
+			tf.ProcessKey (new KeyEvent (Key.CursorLeft | Key.ShiftMask, new KeyModifiers { Shift = true }));
+
+			Assert.Equal (1, tf.CursorPosition);
+			Assert.Equal (2, tf.SelectedLength);
+			Assert.Equal ("is", tf.SelectedText);
+
+			tf.Text = newText;
+			tf.CursorPosition = tf.Text.Length;
+
+			Assert.Equal (newText.Length, tf.CursorPosition);
+			Assert.Equal (0, tf.SelectedLength);
+			Assert.Null (tf.SelectedText);
+		}
 	}
 }
\ No newline at end of file