From ca7db34d8bee6378a1bd5524ea077bc077e730ab Mon Sep 17 00:00:00 2001
From: Alex Dima <alexdima@microsoft.com>
Date: Wed, 5 Jul 2017 15:51:53 +0200
Subject: [PATCH] Fixes #28628: Indent guides should not assume they start at
 offset 0

---
 .../editor/browser/viewParts/indentGuides/indentGuides.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/vs/editor/browser/viewParts/indentGuides/indentGuides.ts b/src/vs/editor/browser/viewParts/indentGuides/indentGuides.ts
index caa4f1449a8..dfd4f11d014 100644
--- a/src/vs/editor/browser/viewParts/indentGuides/indentGuides.ts
+++ b/src/vs/editor/browser/viewParts/indentGuides/indentGuides.ts
@@ -13,6 +13,7 @@ import * as viewEvents from 'vs/editor/common/view/viewEvents';
 import { registerThemingParticipant } from 'vs/platform/theme/common/themeService';
 import { editorIndentGuides } from 'vs/editor/common/view/editorColorRegistry';
 import * as dom from 'vs/base/browser/dom';
+import { Position } from 'vs/editor/common/core/position';
 
 export class IndentGuidesOverlay extends DynamicViewOverlay {
 
@@ -54,6 +55,10 @@ export class IndentGuidesOverlay extends DynamicViewOverlay {
 		}
 		return true;
 	}
+	public onDecorationsChanged(e: viewEvents.ViewDecorationsChangedEvent): boolean {
+		// true for inline decorations
+		return true;
+	}
 	public onFlushed(e: viewEvents.ViewFlushedEvent): boolean {
 		return true;
 	}
@@ -94,7 +99,8 @@ export class IndentGuidesOverlay extends DynamicViewOverlay {
 			let indent = this._context.model.getLineIndentGuide(lineNumber);
 
 			let result = '';
-			let left = 0;
+			let leftMostVisiblePosition = ctx.visibleRangeForPosition(new Position(lineNumber, 1));
+			let left = leftMostVisiblePosition ? leftMostVisiblePosition.left : 0;
 			for (let i = 0; i < indent; i++) {
 				result += `<div class="cigr" style="left:${left}px;height:${lineHeight}px;width:${indentGuideWidth}px"></div>`;
 				left += tabWidth;