Frameless minimum sized window is not restored to previous size after maximize and unmaximize

[christian-judt]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for an issue that matches the one I want to file, without success.

Issue Details

• Electron Version:
  • 7.1.2 - 9.0.0-beta.3 (and presumably later versions until this bug is fixed)
• Operating System:
  • Windows 10 pro (1909)
• Last Known Working Electron version:
  • 7.1.1

Preconditions

• Window is frameless
• Window has minimum size
• Window size is minimum size

Expected behavior

• Window is maximized
• Window is unmaximized
• Window has the same size as before the maximization

Actual Behavior

• Window is maximized
• Window is unmaximized
• Window is slightly higher and wider than before the maximization

To Reproduce

git clone -b frameless-minsize-maximize-unmaximize-bug https://github.com/christian-judt/electron-quick-start.git
cd electron-quick-start
npm install
npm start

Additional Information

• This seems to be a reappearing problem. (for the last occurence see Frameless minimum sized window is not restored to previous size after maximize and unmaximize #13533)
• A similar problem with "minimize-restore" instead of "maximize-unmaximize" has appeared in Electron Version 7.1.10. (see Frameless minimum sized window is not restored to previous size after minimize and restore #22393)

Other maybe related issues

• [Windows] Frameless window size increase on a maximize, unmaximize sequence [Windows] Frameless window size increase on a maximize, unmaximize sequence #2498
• Windows: Restore (after minimize) to wrong window size Windows: Restore (after minimize) to wrong window size #7951
• maximize, minimize, restore incorrect size maximize, minimize, restore incorrect size #15702
• Electron 6 - restore after minimize has wrong window size Electron 6 - restore after minimize has wrong window size #19816

[aleksey-hoffman]

I reproduced it in version 8.0.3. I see the same behavior:

• Resized window to the defined minimum (500x300)
• Maximize, un-maximize
• The window size changes to 515x315

mainWindow = new BrowserWindow({
    title: "Title",
    width: 1280,
    height: 720,
    minWidth: 500,
    minHeight: 300,
    frame: false,
    transparent: false,
    resizable: true
})

[Pettor]

I have similar issue when using frame: false and resizable: false on Windows. Whenever the window is hidden (minimized or closed to taskbar) and I open again the size is incorrect (a pixels wider and higher).