dotnet/winforms

When AutoScroll = true, Form size become smaller after show and hide

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#1,670 opened on Aug 21, 2019

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:beetle: bughelp wanted

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Description

  • .NET Core Version: (3.0 Preview8)
  • Have you experienced this same bug with .NET Framework?: Yes

Problem description: After click form maximize button serval times, form will be very small.

Actual behavior: form size will reduce 17 unit after click form maximize button twice.

Expected behavior: form size not change after click form maximize button twice.

Minimal repro: create a winform project drag a control oveflow form set form AutoScroll = true

Run click maximize button serval times(over 10 times will be very clear), you will find form become smaller than before.

But AutoScroll = false, this issue can not reproduce. WindowsFormsApp3.zip

Contributor guide

Research direction
Investigate the AutoScroll property's effect on form size during maximize/restore cycles. Examine the layout logic in the Form class, specifically the handling of AutoScroll margins or padding that might be incorrectly applied or reset.
Tech stack
csharp
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#.NETWinForms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70