From bd97e46bc614bb86ff18ab493240dc9be2dabd05 Mon Sep 17 00:00:00 2001
From: Zufu Liu <unknown>
Date: Wed, 29 Oct 2025 17:10:25 +1100
Subject: Feature [feature-requests:#1567]. Fix bug when indenting rectangular
 selection.

---
 doc/ScintillaHistory.html |  4 ++++
 src/Editor.cxx            |  8 ++++++++
 test/simpleTests.py       | 18 ++++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 65d6b9fcb..342a87d51 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -610,6 +610,10 @@
 	<a href="https://sourceforge.net/p/scintilla/bugs/2487/">Bug #2487</a>.
 	</li>
 	<li>
+	Fix bug when indenting rectangular selection.
+	<a href="https://sourceforge.net/p/scintilla/feature-requests/1567/">Feature #1567</a>.
+	</li>
+	<li>
 	On Win32, force autocompletion list colours to be opaque.
 	Enlarge bitmap to avoid visible blank background between items.
 	<a href="https://sourceforge.net/p/scintilla/bugs/2482/">Bug #2482</a>.
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 9f3999b08..eb31d40f9 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -4155,6 +4155,12 @@ int Editor::KeyDownWithModifiers(Keys key, KeyMod modifiers, bool *consumed) {
 
 void Editor::Indent(bool forwards, bool lineIndent) {
 	UndoGroup ug(pdoc);
+	// Avoid problems with recalculating rectangular range multiple times by temporarily
+	// treating rectangular selection as multiple stream selection.
+	const Selection::SelTypes selType = sel.selType;
+	if (sel.IsRectangular()) {
+		sel.selType = Selection::SelTypes::stream;
+	}
 	for (size_t r=0; r<sel.Count(); r++) {
 		const Sci::Line lineOfAnchor =
 			pdoc->SciLineFromPosition(sel.Range(r).anchor.Position());
@@ -4231,6 +4237,8 @@ void Editor::Indent(bool forwards, bool lineIndent) {
 			}
 		}
 	}
+	sel.selType = selType;	// Restore rectangular mode
+	ThinRectangularRange();
 	ContainerNeedsUpdate(Update::Selection);
 }
 
diff --git a/test/simpleTests.py b/test/simpleTests.py
index 0389d6dbc..020b72e99 100644
--- a/test/simpleTests.py
+++ b/test/simpleTests.py
@@ -312,6 +312,24 @@ class TestSimple(unittest.TestCase):
 		self.assertEqual(self.ed.Contents(), b"\tx\tb")
 		self.assertEqual(self.ed.GetLineIndentPosition(0), 1)
 
+	def testRectangularIndent(self):
+		self.ed.VirtualSpaceOptions = 3
+		self.ed.AddText(3, b"\n\n\n")
+		self.ed.RectangularSelectionAnchor = 2
+		self.ed.RectangularSelectionCaret = 0
+		self.ed.TabIndents = 0
+		self.ed.UseTabs = 1
+		self.ed.Tab()
+		self.assertEqual(self.ed.Contents(), b"\t\n\t\n\t\n")
+		self.assertEqual(self.ed.GetSelectionSerialized(), b'T#2,5-1')
+		self.assertEqual(self.ed.GetSelectionNAnchor(0), 5)
+		self.assertEqual(self.ed.GetSelectionNCaret(0), 5)
+		self.assertEqual(self.ed.GetSelectionNAnchor(1), 3)
+		self.assertEqual(self.ed.GetSelectionNCaret(1), 3)
+		self.assertEqual(self.ed.GetSelectionNAnchor(2), 1)
+		self.assertEqual(self.ed.GetSelectionNCaret(2), 1)
+		self.ed.VirtualSpaceOptions = 0
+
 	def testGetCurLine(self):
 		self.ed.AddText(1, b"x")
 		data = ctypes.create_string_buffer(b"\0" * 100)
-- 
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