From 724429a7c661eeafe3094a049f747267d0496a69 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Mon, 8 Dec 2025 14:38:07 +1100
Subject: Bug [#2488]. Fix SCI_SETSELECTIONNSTART and SCI_SETSELECTIONNEND.

---
 test/simpleTests.py         | 22 +++++++++++
 test/unit/testSelection.cxx | 90 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)

(limited to 'test')

diff --git a/test/simpleTests.py b/test/simpleTests.py
index 020b72e99..4e6a51d59 100644
--- a/test/simpleTests.py
+++ b/test/simpleTests.py
@@ -1967,6 +1967,28 @@ class TestMultiSelection(unittest.TestCase):
 		self.assertEqual(self.ed.GetSelectionNStart(0), 2)
 		self.assertEqual(self.ed.GetSelectionNEnd(0), 3)
 
+		self.ed.SetSelectionNStart(0, 1)
+		self.assertEqual(self.ed.GetSelectionNAnchor(0), 1)
+		self.assertEqual(self.ed.GetSelectionNCaret(0), 3)
+		self.assertEqual(self.ed.GetSelectionNStart(0), 1)
+		self.assertEqual(self.ed.GetSelectionNEnd(0), 3)
+
+		self.ed.SetSelectionNAnchor(0, 2)
+		self.ed.SetSelectionNCaret(0, 2)
+		self.ed.SetSelectionNStart(0, 9)
+		self.assertEqual(self.ed.GetSelectionNAnchor(0), 9)
+		self.assertEqual(self.ed.GetSelectionNCaret(0), 9)
+		self.assertEqual(self.ed.GetSelectionNStart(0), 9)
+		self.assertEqual(self.ed.GetSelectionNEnd(0), 9)
+
+		self.ed.SetSelectionNAnchor(0, 2)
+		self.ed.SetSelectionNCaret(0, 3)
+		self.ed.SetSelectionNStart(0, 9)
+		self.assertEqual(self.ed.GetSelectionNAnchor(0), 9)
+		self.assertEqual(self.ed.GetSelectionNCaret(0), 9)
+		self.assertEqual(self.ed.GetSelectionNStart(0), 9)
+		self.assertEqual(self.ed.GetSelectionNEnd(0), 9)
+
 	def test2Selections(self):
 		self.ed.SetSelection(1, 2)
 		self.ed.AddSelection(4, 5)
diff --git a/test/unit/testSelection.cxx b/test/unit/testSelection.cxx
index ab0065624..76eebca21 100644
--- a/test/unit/testSelection.cxx
+++ b/test/unit/testSelection.cxx
@@ -198,6 +198,96 @@ TEST_CASE("SelectionRange") {
 		REQUIRE(thin == single);
 	}
 
+	SECTION("StartEndSet") {
+		{
+			SelectionRange range;
+
+			range.StartSet(SelectionPosition(2));
+			range.EndSet(SelectionPosition(3));
+			REQUIRE(range.Start() == SelectionPosition(2));
+			REQUIRE(range.End() == SelectionPosition(3));
+			REQUIRE(range == SelectionRange(3, 2));
+
+			range.StartSet(SelectionPosition(1));
+			REQUIRE(range.Start() == SelectionPosition(1));
+			REQUIRE(range.End() == SelectionPosition(3));
+			REQUIRE(range == SelectionRange(3, 1));
+		}
+
+		{
+			// Outside after
+			SelectionRange range(2, 1);
+			range.StartSet(SelectionPosition(3));
+			REQUIRE(range.Start() == SelectionPosition(3));
+			REQUIRE(range.End() == SelectionPosition(3));
+			REQUIRE(range == SelectionRange(3, 3));
+		}
+
+		{
+			// Outside after
+			SelectionRange range(2, 1);
+			range.EndSet(SelectionPosition(3));
+			REQUIRE(range.Start() == SelectionPosition(1));
+			REQUIRE(range.End() == SelectionPosition(3));
+			REQUIRE(range == SelectionRange(3, 1));
+		}
+
+		{
+			// Outside before
+			SelectionRange range(2, 1);
+			range.StartSet(SelectionPosition(0));
+			REQUIRE(range.Start() == SelectionPosition(0));
+			REQUIRE(range.End() == SelectionPosition(2));
+			REQUIRE(range == SelectionRange(2, 0));
+		}
+
+		{
+			// Outside before
+			SelectionRange range(2, 1);
+			range.EndSet(SelectionPosition(0));
+			REQUIRE(range.Start() == SelectionPosition(0));
+			REQUIRE(range.End() == SelectionPosition(0));
+			REQUIRE(range == SelectionRange(0, 0));
+		}
+
+		{
+			// Inside
+			SelectionRange range(3, 1);
+			range.EndSet(SelectionPosition(2));
+			REQUIRE(range.Start() == SelectionPosition(1));
+			REQUIRE(range.End() == SelectionPosition(2));
+			REQUIRE(range == SelectionRange(2, 1));
+		}
+
+		{
+			// Inside
+			SelectionRange range(3, 1);
+			range.StartSet(SelectionPosition(2));
+			REQUIRE(range.Start() == SelectionPosition(2));
+			REQUIRE(range.End() == SelectionPosition(3));
+			REQUIRE(range == SelectionRange(3, 2));
+		}
+
+		{
+			// Empty then outside
+			SelectionRange range(2);
+			range.StartSet(SelectionPosition(9));
+			REQUIRE(range.Start() == SelectionPosition(9));
+			REQUIRE(range.End() == SelectionPosition(9));
+			REQUIRE(range == SelectionRange(9, 9));
+		}
+
+		{
+			// Empty then outside
+			SelectionRange range(2);
+			range.StartSet(SelectionPosition(0));
+			REQUIRE(range.Start() == SelectionPosition(0));
+			REQUIRE(range.End() == SelectionPosition(2));
+			REQUIRE(range == SelectionRange(2, 0));
+		}
+
+	}
+
 }
 
 TEST_CASE("Selection") {
-- 
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