Fixes: preserve taskbar monitor selection + widget vanishing when start menu opens + monitor selector

src/localization/dutch.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Instellingen",
     start_with_windows: "Opstarten met Windows",
     reset_position: "Positie herstellen",
+    monitor: "Beeldscherm",
     language: "Taal",
     system_default: "Systeemstandaard",
     check_for_updates: "Controleren op updates",

src/localization/english.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Settings",
     start_with_windows: "Start with Windows",
     reset_position: "Reset Position",
+    monitor: "Monitor",
     language: "Language",
     system_default: "System Default",
     check_for_updates: "Check for Updates",

src/localization/french.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Paramètres",
     start_with_windows: "Démarrer avec Windows",
     reset_position: "Réinitialiser la position",
+    monitor: "Écran",
     language: "Langue",
     system_default: "Par défaut du système",
     check_for_updates: "Vérifier les mises à jour",

src/localization/german.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Einstellungen",
     start_with_windows: "Mit Windows starten",
     reset_position: "Position zurücksetzen",
+    monitor: "Monitor",
     language: "Sprache",
     system_default: "Systemstandard",
     check_for_updates: "Nach Updates suchen",

src/localization/japanese.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "設定",
     start_with_windows: "Windows と同時に開始",
     reset_position: "位置をリセット",
+    monitor: "モニター",
     language: "言語",
     system_default: "システム既定",
     check_for_updates: "更新を確認",

src/localization/korean.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "설정",
     start_with_windows: "Windows 시작 시 자동 실행",
     reset_position: "위치 초기화",
+    monitor: "모니터",
     language: "언어",
     system_default: "시스템 기본값",
     check_for_updates: "업데이트 확인",

src/localization/mod.rs

@@ -151,6 +151,7 @@ pub struct Strings {
     pub settings: &'static str,
     pub start_with_windows: &'static str,
     pub reset_position: &'static str,
+    pub monitor: &'static str,
     pub language: &'static str,
     pub system_default: &'static str,
     pub check_for_updates: &'static str,

src/localization/portuguese_brazil.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Configurações",
     start_with_windows: "Iniciar com o Windows",
     reset_position: "Redefinir Posição",
+    monitor: "Monitor",
     language: "Idioma",
     system_default: "Padrão do Sistema",
     check_for_updates: "Busca atualizações",

src/localization/russian.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Настройки",
     start_with_windows: "Запускать вместе с Windows",
     reset_position: "Сбросить позицию",
+    monitor: "Монитор",
     language: "Язык",
     system_default: "Системный по умолчанию",
     check_for_updates: "Проверить обновления",

src/localization/spanish.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "Configuración",
     start_with_windows: "Iniciar con Windows",
     reset_position: "Restablecer posición",
+    monitor: "Monitor",
     language: "Idioma",
     system_default: "Predeterminado del sistema",
     check_for_updates: "Buscar actualizaciones",

src/localization/traditional_chinese.rs

@@ -17,6 +17,7 @@ pub(super) const STRINGS: Strings = Strings {
     settings: "設定",
     start_with_windows: "開機時啟動",
     reset_position: "重置位置",
+    monitor: "螢幕",
     language: "語言",
     system_default: "系統預設",
     check_for_updates: "檢查更新",

src/native_interop.rs

@@ -1,5 +1,11 @@
 use windows::core::PCWSTR;
 use windows::Win32::Foundation::{BOOL, HWND, LPARAM, RECT};
+use windows::Win32::Graphics::Gdi::{
+    GetMonitorInfoW, MonitorFromWindow, MONITORINFOEXW, MONITOR_DEFAULTTONEAREST,
+};
+
+/// `MONITORINFOF_PRIMARY` — not re-exported by this `windows` crate version.
+const MONITORINFOF_PRIMARY: u32 = 0x0000_0001;
 use windows::Win32::UI::Accessibility::{SetWinEventHook, UnhookWinEvent, HWINEVENTHOOK};
 use windows::Win32::UI::Shell::{SHAppBarMessage, ABM_GETTASKBARPOS, APPBARDATA};
 use windows::Win32::UI::WindowsAndMessaging::*;
@@ -24,10 +30,40 @@ pub const WM_APP: u32 = 0x8000;
 pub const WM_APP_USAGE_UPDATED: u32 = WM_APP + 1;
 pub const WM_APP_TRAY: u32 = WM_APP + 3;
 
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Debug)]
 pub struct TaskbarWindow {
     pub hwnd: HWND,
     pub rect: RECT,
+    /// Stable monitor identity (e.g. "\\\\.\\DISPLAY1"). Used to keep the widget
+    /// anchored to the same physical monitor across topology changes, where the
+    /// geometric ordering (and therefore the index) of taskbars can shift.
+    pub device: String,
+    /// True if this taskbar lives on the primary monitor. Used as the fallback
+    /// anchor when the remembered device is gone, so we never re-trigger the
+    /// "widget jumps to the topmost (often secondary) taskbar" bug (#43).
+    pub is_primary: bool,
+}
+
+/// Stable identity of the monitor a window currently lives on: its device name
+/// and whether it is the primary monitor.
+pub fn monitor_identity(hwnd: HWND) -> (String, bool) {
+    unsafe {
+        let monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
+        let mut info = MONITORINFOEXW::default();
+        info.monitorInfo.cbSize = std::mem::size_of::<MONITORINFOEXW>() as u32;
+        if GetMonitorInfoW(monitor, &mut info as *mut _ as *mut _).as_bool() {
+            let len = info
+                .szDevice
+                .iter()
+                .position(|&c| c == 0)
+                .unwrap_or(info.szDevice.len());
+            let device = String::from_utf16_lossy(&info.szDevice[..len]);
+            let is_primary = info.monitorInfo.dwFlags & MONITORINFOF_PRIMARY != 0;
+            (device, is_primary)
+        } else {
+            (String::new(), false)
+        }
+    }
 }
 
 pub fn find_taskbars() -> Vec<TaskbarWindow> {
@@ -39,7 +75,13 @@ pub fn find_taskbars() -> Vec<TaskbarWindow> {
             let class_name = String::from_utf16_lossy(&class_name[..len as usize]);
             if class_name == "Shell_TrayWnd" || class_name == "Shell_SecondaryTrayWnd" {
                 if let Some(rect) = get_taskbar_rect(hwnd).or_else(|| get_window_rect_safe(hwnd)) {
-                    taskbars.push(TaskbarWindow { hwnd, rect });
+                    let (device, is_primary) = monitor_identity(hwnd);
+                    taskbars.push(TaskbarWindow {
+                        hwnd,
+                        rect,
+                        device,
+                        is_primary,
+                    });
                 }
             }
         }
@@ -169,6 +211,10 @@ pub fn get_window_thread_id(hwnd: HWND) -> u32 {
     unsafe { GetWindowThreadProcessId(hwnd, None) }
 }
 
+pub fn window_exists(hwnd: HWND) -> bool {
+    unsafe { IsWindow(hwnd).as_bool() }
+}
+
 /// Unhook a WinEvent hook
 pub fn unhook_win_event(hook: HWINEVENTHOOK) {
     unsafe {