Repository: electron/electron
Pull request: fix: take Snapped status into account when showing a window

#### Description of Change

Closes https://github.com/electron/electron/issues/25359.
Refs CL:6330848

This PR adjusts `HWNDMessageHandler::Show` to correctly restore windows that were
in a snapped state prior to being hidden or maximized. The logic already took into account a window being maximized and correctly restored it, but if the window was snapped prior to this PR it would be removed from its snapped state when re-shown.

cc @Nantris

#### Checklist
<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->

- [x] PR description included and stakeholders cc'd
- [x] `npm test` passes
- [x] [PR release notes](https://github.com/electron/clerk/blob/main/README.md) describe the change in a way relevant to app developers, and are [capitalized, punctuated, and past tense](https://github.com/electron/clerk/blob/main/README.md#examples).

#### Release Notes

Notes: Fixed an issue where snapped windows in Windows may sometimes be improperly restored.


Changed files:
filename: patches/chromium/.patches
patch: @@ -142,3 +142,4 @@ feat_separate_content_settings_callback_for_sync_and_async_clipboard.patch
 fix_win32_synchronous_spellcheck.patch
 fix_enable_wrap_iter_in_string_view_and_array.patch
 fix_linter_error.patch
+fix_take_snapped_status_into_account_when_showing_a_window.patch

filename: patches/chromium/fix_take_snapped_status_into_account_when_showing_a_window.patch
patch: @@ -0,0 +1,58 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shelley Vohr <shelley.vohr@gmail.com>
+Date: Thu, 13 Mar 2025 10:47:00 +0100
+Subject: fix: take Snapped status into account when showing a window
+
+Adjusts HWNDMessageHandler::Show to correctly restore windows that were
+in a snapped state prior to being hidden or maximized. From Windows
+documentation at
+https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-iswindowarranged:
+
+> A snapped window (see Snap your windows) is considered to be arranged.
+> You should treat arranged as a window state similar to maximized. Arranged,
+> maximized, and minimized are mutually exclusive states.
+
+The logic already took into account a window being maximized and
+correctly restored it, but if the window was snapped prior to this CL it
+would be removed from its snapped state when re-shown. This fixes that.
+
+Upstreamed at https://chromium-review.googlesource.com/c/chromium/src/+/6330848.
+
+diff --git a/ui/views/win/hwnd_message_handler.cc b/ui/views/win/hwnd_message_handler.cc
+index 22ed43bdf4dbaccc598135807abc8383c52db50e..c5457e3e58b53ca04697b22a885da654c6c0655f 100644
+--- a/ui/views/win/hwnd_message_handler.cc
++++ b/ui/views/win/hwnd_message_handler.cc
+@@ -676,7 +676,8 @@ void HWNDMessageHandler::Show(ui::mojom::WindowShowState show_state,
+     SetWindowPlacement(hwnd(), &placement);
+     native_show_state = SW_SHOWMAXIMIZED;
+   } else {
+-    const bool is_maximized = IsMaximized();
++    const bool is_maximized_or_arranged =
++        IsMaximized() || IsWindowArranged(hwnd());
+ 
+     // Use SW_SHOW/SW_SHOWNA instead of SW_SHOWNORMAL/SW_SHOWNOACTIVATE so that
+     // the window is not restored to its original position if it is maximized.
+@@ -686,7 +687,8 @@ void HWNDMessageHandler::Show(ui::mojom::WindowShowState show_state,
+     // position, some do not. See crbug.com/1296710
+     switch (show_state) {
+       case ui::mojom::WindowShowState::kInactive:
+-        native_show_state = is_maximized ? SW_SHOWNA : SW_SHOWNOACTIVATE;
++        native_show_state =
++            is_maximized_or_arranged ? SW_SHOWNA : SW_SHOWNOACTIVATE;
+         break;
+       case ui::mojom::WindowShowState::kMaximized:
+         native_show_state = SW_SHOWMAXIMIZED;
+@@ -697,9 +699,11 @@ void HWNDMessageHandler::Show(ui::mojom::WindowShowState show_state,
+       case ui::mojom::WindowShowState::kNormal:
+         if ((GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_TRANSPARENT) ||
+             (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)) {
+-          native_show_state = is_maximized ? SW_SHOWNA : SW_SHOWNOACTIVATE;
++          native_show_state =
++              is_maximized_or_arranged ? SW_SHOWNA : SW_SHOWNOACTIVATE;
+         } else {
+-          native_show_state = is_maximized ? SW_SHOW : SW_SHOWNORMAL;
++          native_show_state =
++              is_maximized_or_arranged ? SW_SHOW : SW_SHOWNORMAL;
+         }
+         break;
+       case ui::mojom::WindowShowState::kFullscreen: