From bcf0d745727cca275e7ac33fd97be5a5fe1c4d9b Mon Sep 17 00:00:00 2001
From: UnathiCodex <theunathi@gmail.com>
Date: Thu, 16 Jul 2026 21:21:43 +0200
Subject: [PATCH] fix(desktop): preserve zoom across display moves (#65874)

Reassert the persisted webContents zoom after BrowserWindow moved, covering Windows monitor transitions where Chromium recalculates display scaling and drops the user-selected zoom.
---
 apps/desktop/electron/main.ts      | 5 +++--
 apps/desktop/electron/zoom.test.ts | 5 +++--
 apps/desktop/electron/zoom.ts      | 5 +++--
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/apps/desktop/electron/main.ts b/apps/desktop/electron/main.ts
index 1aec6d7e8e18..d9c14e066019 100644
--- a/apps/desktop/electron/main.ts
+++ b/apps/desktop/electron/main.ts
@@ -6981,8 +6981,9 @@ function wireCommonWindowHandlers(win, { zoom = true }: { zoom?: boolean } = {})
 
   if (zoom) {
     installZoomShortcuts(win)
-    // Re-apply persisted zoom on show/restore (Windows drops webContents zoom on
-    // minimize/restore) and on first load (reloads / crash recovery).
+    // Re-apply persisted zoom on show/restore/cross-display move (Windows can
+    // drop webContents zoom after minimize or a monitor-scale change) and on
+    // first load (reloads / crash recovery).
     installZoomReassertOnWindowEvents(win, () => restorePersistedZoomLevel(win))
     win.webContents.once('did-finish-load', () => restorePersistedZoomLevel(win))
   }
diff --git a/apps/desktop/electron/zoom.test.ts b/apps/desktop/electron/zoom.test.ts
index d0a1517d38e5..7fb81299494e 100644
--- a/apps/desktop/electron/zoom.test.ts
+++ b/apps/desktop/electron/zoom.test.ts
@@ -64,7 +64,7 @@ test('extreme percentages clamp to the level bounds', () => {
   assert.equal(percentToZoomLevel(1_000_000), 9)
 })
 
-test('installZoomReassertOnWindowEvents wires show and restore', () => {
+test('installZoomReassertOnWindowEvents wires show, restore, and cross-display moves', () => {
   const handlers = new Map()
 
   const win = {
@@ -82,7 +82,8 @@ test('installZoomReassertOnWindowEvents wires show and restore', () => {
   assert.deepEqual([...handlers.keys()], [...ZOOM_REASSERT_WINDOW_EVENTS])
   handlers.get('show')()
   handlers.get('restore')()
-  assert.equal(calls, 2)
+  handlers.get('moved')()
+  assert.equal(calls, 3)
 })
 
 test('installZoomReassertOnWindowEvents skips destroyed windows', () => {
diff --git a/apps/desktop/electron/zoom.ts b/apps/desktop/electron/zoom.ts
index baf8ff48b70e..aa7f31bc240b 100644
--- a/apps/desktop/electron/zoom.ts
+++ b/apps/desktop/electron/zoom.ts
@@ -49,8 +49,9 @@ export function applyZoomLevel(webContents, level) {
 }
 
 // Chromium on Windows can drop webContents zoom when a BrowserWindow is minimized
-// and restored. Re-apply the persisted level on these lifecycle transitions.
-export const ZOOM_REASSERT_WINDOW_EVENTS = ['show', 'restore']
+// and restored or crosses onto a monitor with different display scaling. Re-apply
+// the persisted level after each completed lifecycle transition.
+export const ZOOM_REASSERT_WINDOW_EVENTS = ['show', 'restore', 'moved']
 
 export function installZoomReassertOnWindowEvents(win, reassert) {
   if (!win?.on) {