SetAspectRatio should constrain the content area consistently across platforms

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#64 opened on Sep 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: 48/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Active
Tech stack: cpp
Domain: desktop

Research direction

Start at Window::SetAspectRatio and trace the platform-specific implementations, especially Windows WM_SIZING and programmatic resize handling, alongside Linux geometry hints and macOS contentAspectRatio. Done means the Flutter content area, rather than the whole window including non-client decorations, maintains the requested aspect ratio consistently across platforms.

Written by the indexing model from the issue text.

Description

bug

Window::SetAspectRatio() behaves differently per platform:

macOS constrains the content area (contentAspectRatio), unless the content is full-size.
Windows constrains the whole window rect in WM_SIZING, title bar and borders included, so the Flutter view ends up with a different ratio.
Linux uses geometry hints on the window, and users report the content not matching the ratio.

Expected: the ratio applies to the content area on all platforms. On Windows, subtract the non-client size before applying the ratio in WM_SIZING, and apply it to programmatic resizes too.

Background:

leanflutter/window_manager#437: exclude the title bar from the aspect-ratio calculation
leanflutter/window_manager#520: actual window ratio differs from the one set
leanflutter/window_manager#566: setAspectRatio behaves differently on Windows and Linux

Dominant language: C++
Stars: 34
Forks: 7
Avg merge: 3d 1h
Merged PRs (30d): 1

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