From 1dbad6101e7d912bcff39c8048b52382fa9a57b5 Mon Sep 17 00:00:00 2001
From: R Midhun Suresh <hi@midhun.dev>
Date: Sun, 29 Mar 2026 17:53:53 +0530
Subject: [PATCH] Collapsible Room List - Clicking on separator should expand
 to last set width (#32909)

* Expand panel to last known width

* Update test
---
 apps/web/src/viewmodels/structures/ResizerViewModel.ts       | 3 ++-
 apps/web/test/viewmodels/structures/ResizerViewModel-test.ts | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/apps/web/src/viewmodels/structures/ResizerViewModel.ts b/apps/web/src/viewmodels/structures/ResizerViewModel.ts
index 10fa0a4193..3eeefed245 100644
--- a/apps/web/src/viewmodels/structures/ResizerViewModel.ts
+++ b/apps/web/src/viewmodels/structures/ResizerViewModel.ts
@@ -75,7 +75,8 @@ export class ResizerViewModel
 
     public onSeparatorClick = (): void => {
         if (this.panelHandle?.isCollapsed()) {
-            this.panelHandle.resize(`100%`);
+            const lastSize = SettingsStore.getValue("RoomList.panelSize");
+            this.panelHandle.resize(`${lastSize}%`);
         }
     };
 
diff --git a/apps/web/test/viewmodels/structures/ResizerViewModel-test.ts b/apps/web/test/viewmodels/structures/ResizerViewModel-test.ts
index aacdb95bf1..706efa7524 100644
--- a/apps/web/test/viewmodels/structures/ResizerViewModel-test.ts
+++ b/apps/web/test/viewmodels/structures/ResizerViewModel-test.ts
@@ -70,6 +70,7 @@ describe("LeftPanelResizerViewModel", () => {
 
     it("should expand panel on onSeparatorClick()", () => {
         const vm = new ResizerViewModel();
+        SettingsStore.setValue("RoomList.panelSize", null, SettingLevel.DEVICE, 34);
         const mockHandle = {
             resize: jest.fn(),
             isCollapsed: jest.fn().mockReturnValue(true),
@@ -78,7 +79,7 @@ describe("LeftPanelResizerViewModel", () => {
 
         vm.onSeparatorClick();
 
-        expect(mockHandle.resize).toHaveBeenCalledWith("100%");
+        expect(mockHandle.resize).toHaveBeenCalledWith("34%");
     });
 
     it("should set isFocusedViaKeyboard state correctly", () => {