How do I get the OS window position in electron? - user-interface

Question

I'm trying to get an electron app to reopen at the same position on the screen as it was when closed for the last time.
To do this I have a config file that records the boundaries of the window when it is closed.
function set(settingKey, settingValue) {
nconf.set(settingKey, settingValue);
nconf.save();
};
mainWindow.on('close', function () {
config.set('bounds', mainWindow.getBounds());
});
But when I restart the app and set the position of the mainWindow by specifying the x, y, width, height options or with a call to setBounds:
mainWindow.setBounds(config.get('bounds'));
the window appears a bit lower than previously. I figured out that the y value I get doesn't take into account the title bar height of the window.
This question is similar but the solution results in the same issue.
I have tried:
mainWindow.getPosition
mainWindow.getContentBounds coupled with setContentBounds
electron.screen.getDisplayMatching(mainWindow.getBounds()).bounds
to no avail. The first two methods give me exactly the same results. The last one gives { x: 0, y: 0, width: 1920, height: 1080 }.
Does anyone know how to get the OS window position in electron?
If it helps at all, I am on Wayland (Gnome 3.32).

Answer 1

Looks like a long-time unresolved bug on Linux:
On Linux, returned position of fixed BrowserWindow gets unexpectedly modified
For example, the following:
const { app, BrowserWindow } = require ('electron');
let mainWindow = null;
function onAppReady ()
{
let position = [ 200, 100 ];
console.log ('init:', position);
mainWindow = new BrowserWindow ({ x: position[0], y: position[1], width: 800, height: 600, show: false });
console.log ('new:', mainWindow.getPosition ());
mainWindow.loadURL (`file://${__dirname}/index.html`);
mainWindow.on ('ready-to-show', () => {
mainWindow.show ();
console.log ('show:', mainWindow.getPosition ()); });
mainWindow.on ('close', () => { console.log ('close:', mainWindow.getPosition ()); });
mainWindow.on ('closed', () => { app.quit (); });
}
app.on ('ready', onAppReady);
results in:
Linux Mint:
init: [ 200, 100 ]
new: [ 200, 100 ]
show: [ 201, 125 ]
close: [ 201, 125 ]
Ubuntu:
init: [ 200, 100 ]
new: [ 200, 100 ]
show: [ 200, 100 ]
close: [ 200, 128 ]