Fix console input cursor not repositioning after output

debug/org.eclipse.debug.tests/src/org/eclipse/debug/tests/console/IOConsoleTests.java

@@ -1139,4 +1139,30 @@ public void testIsAnsiEscapeEnabled() throws ExecutionException, NotDefinedExcep
 		final boolean changedBack = IOConsole.isAnsiConsoleEnabled();
 		assertEquals(initial, changedBack);
 	}
+
+
+	@Test
+	public void testBug2127_CaretRepositionedAfterOutput() throws Exception {
+		IOConsoleTestUtil c = getTestUtil("Test caret reposition after output");
+		try {
+			c.writeAndVerify("Please type something: ");
+			c.insertTypingAndVerify("42");
+			c.enter();
+			TestUtil.waitWhile(() -> c.getCaretOffset() != c.getContentLength(), TestUtil.DEFAULT_TIMEOUT, () -> "Caret never reached end of document after submitting input.");
+
+			int caretBeforeOutput = c.getCaretOffset();
+			c.writeAndVerify("You typed: 42");
+			TestUtil.waitWhile(() -> c.getCaretOffset() != c.getContentLength(), TestUtil.DEFAULT_TIMEOUT, () -> "Caret was not repositioned to end of document after output arrived at the old (now read-only) caret position.");
+
+			assertTrue(c.getPartitioner().isReadOnly(caretBeforeOutput), "Precondition: old caret position must now be read-only.");
+
+			c.insertTypingAndVerify("7");
+			c.enter().clear();
+			c.verifyPartitions();
+			closeConsole(c, "42", "7");
+		} finally {
+			ConsolePlugin.getDefault().getConsoleManager().removeConsoles(new IConsole[] {
+					c.getConsole() });
+		}
+	}
 }

debug/org.eclipse.ui.console/src/org/eclipse/ui/internal/console/IOConsoleViewer.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2019 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -225,10 +225,43 @@ public void documentAboutToBeChanged(DocumentEvent event) {
 				public void documentChanged(DocumentEvent event) {
 					if (fAutoScroll) {
 						revealEndOfDocument();
+						repositionCaretAfterOutput();
 					}
 				}
 			};
 		}
 		return fAutoScrollListener;
 	}
+
+	/**
+	 * Moves caret to the beginning of next valid input section
+	 */
+	private void repositionCaretAfterOutput() {
+		final IDocument doc = getDocument();
+		if (doc == null) {
+			return;
+		}
+		if (doc.getDocumentPartitioner() instanceof IConsoleDocumentPartitioner consolePart
+				&& consolePart instanceof IConsoleDocumentPartitionerExtension consolePartExt) {
+			StyledText widget = getTextWidget();
+			if (widget == null || widget.isDisposed()) {
+				return;
+			}
+			ConsolePlugin.getStandardDisplay().asyncExec(() -> {
+				StyledText styleText = getTextWidget();
+				if (styleText == null || styleText.isDisposed()) {
+					return;
+				}
+				int caretOffset = widget.getCaretOffset();
+				if (consolePart.isReadOnly(caretOffset) && consolePart.isReadOnly(Math.max(caretOffset - 1, 0))) {
+					int nextWritable = consolePartExt.getNextOffsetByState(caretOffset, true);
+					if (nextWritable != caretOffset) {
+						styleText.setCaretOffset(nextWritable);
+						styleText.showSelection();
+					}
+				}
+			});
+		}
+
+	}
 }