[desktop-multi-window] Starting new window while in fullscreen mode on macos always moves the screen

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#461 opened on Jan 21, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: flutter, macos
Domain: desktop

Research direction

Start by reproducing the fullscreen and window-spawn sequence in the desktop_multi_window plugin on macOS, then inspect its macOS window-creation path. Done means spawning a new window without moving focus away from the fullscreen main window; verify the behavior with the reproduction steps and Flutter 3.32.

Written by the indexing model from the issue text.

Description

It is impossible to silently start a window (for example a overlay indicator) without disturbing main window while in fullscreen mode on macos.

Reproduce Steps

Steps to reproduce the behavior:

Open example
Click system fullscreen mode button on main window (green one)
spawn window
Screen jumps to another window

I tried many different options using window manager and multi window without success (dont focus etc)
There should be a way to spawn window

Flutter 3.32
OS: macos
plugin: desktop_multi_window 0.3.0

Dominant language: C
Stars: 512
Forks: 292
Avg merge: 15h 8m
Merged PRs (30d): 7

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