Bug 37365 - Container (Panel, Picturebox..) wrong size
Summary: Container (Panel, Picturebox..) wrong size
Alias: None
Product: Class Libraries
Classification: Mono
Component: Windows.Forms ()
Version: unspecified
Hardware: All Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2016-01-03 15:25 UTC by Harry May
Modified: 2016-02-08 21:18 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

test program for wrong size (54.97 KB, application/zip)
2016-01-03 15:25 UTC, Harry May

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.

Please create a new report on GitHub or Developer Community with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:

Description Harry May 2016-01-03 15:25:54 UTC
Created attachment 14425 [details]
test program for wrong size

The size of i.e. a Panel (or Picturebox) is different from the programmed size (larger).

I have attached a very simple program which shows this bug. It can be compiled with VS15 or gmcs.
* a Form includes a Panel with size 500x500 pixel, yellow background color
* a bitmap which is also 500x500 pixel (red color) is drawn into this panel
it is expected that just the red bitmap is visible since it completely fills the yellow panel.

This works well in .NET. But in mono the size of the panel is not 500x500 but it is larger than programmed.
Additionally the size is different on a PC (Ubuntu, Suse..) or on a Raspberry.
In Linux you still see a part of the yellow panel because it is too large.
Comment 1 Grady Ellison 2016-01-31 19:08:23 UTC
I had this same issue with my project. The workaround I figured out is to comment out AutoScaleDimensions and AutoScaleMode in MainForm.
Comment 2 Harry May 2016-02-08 21:14:57 UTC
Grady, thanks, this commenting out these lines work fine.
Comment 3 Harry May 2016-02-08 21:18:39 UTC
the same effect has setting AutoScaleMode "none"