From 9ae16f2eddda81a246db83c818703174fa9c16bb Mon Sep 17 00:00:00 2001
From: Kristiyan Kostadinov <crisbeto@abv.bg>
Date: Fri, 9 Jun 2023 09:02:13 +0200
Subject: [PATCH] fix(material/select): provide horizontal fallback positions

The select had configured its positions under the assumption that the dropdown is always as wide as the trigger so it only provided a vertical fallback position. Since users are now able to control the panel width, we also need horizontal fallbacks.

Fixes #27256.
---
 src/material/select/select.ts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/material/select/select.ts b/src/material/select/select.ts
index 47856141a745..8abddb070140 100644
--- a/src/material/select/select.ts
+++ b/src/material/select/select.ts
@@ -1303,6 +1303,12 @@ export class MatSelect extends _MatSelectBase<MatSelectChange> implements OnInit
       overlayX: 'start',
       overlayY: 'top',
     },
+    {
+      originX: 'end',
+      originY: 'bottom',
+      overlayX: 'end',
+      overlayY: 'top',
+    },
     {
       originX: 'start',
       originY: 'top',
@@ -1310,6 +1316,13 @@ export class MatSelect extends _MatSelectBase<MatSelectChange> implements OnInit
       overlayY: 'bottom',
       panelClass: 'mat-mdc-select-panel-above',
     },
+    {
+      originX: 'end',
+      originY: 'top',
+      overlayX: 'end',
+      overlayY: 'bottom',
+      panelClass: 'mat-mdc-select-panel-above',
+    },
   ];
 
   /** Ideal origin for the overlay panel. */