From b35db4827da20b211a0f1ebddbae5ecec5d3536a Mon Sep 17 00:00:00 2001
From: Alf Eaton <alf.eaton@overleaf.com>
Date: Thu, 18 May 2023 14:30:32 +0100
Subject: [PATCH] Merge pull request #13120 from
 overleaf/dk-drawselection-cm-patch

[cm6] apply cm patch for drawSelection bug

GitOrigin-RevId: 3adfcdbea4cc18d2cc197c153323fc62bafc364f
---
 .../web/frontend/js/features/source-editor/utils/layer.ts    | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/services/web/frontend/js/features/source-editor/utils/layer.ts b/services/web/frontend/js/features/source-editor/utils/layer.ts
index 8e96ecb39d..7f3bbc8701 100644
--- a/services/web/frontend/js/features/source-editor/utils/layer.ts
+++ b/services/web/frontend/js/features/source-editor/utils/layer.ts
@@ -173,7 +173,10 @@ function rectanglesForRange(
       : drawForWidget(endBlock, true)
     const between = []
 
-    if ((visualStart || startBlock).to < (visualEnd || endBlock).from - 1)
+    if (
+      (visualStart || startBlock).to <
+      (visualEnd || endBlock).from - (visualStart && visualEnd ? 1 : 0)
+    )
       between.push(piece(leftSide, top.bottom, rightSide, bottom.top))
     else if (
       top.bottom < bottom.top &&