Bug 47603 - Ugly mouse cursor on KDE Plasma desktop
Summary: Ugly mouse cursor on KDE Plasma desktop
Alias: None
Product: Class Libraries
Classification: Mono
Component: Windows.Forms ()
Version: 4.6.0 (C8)
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2016-11-21 21:48 UTC by elvis.angelaccio
Modified: 2016-11-22 15:47 UTC (History)
1 user (show)

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

WinForms hello.cs test app used to reproduce the issue (238 bytes, text/x-csharp)
2016-11-21 21:48 UTC, elvis.angelaccio

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Description elvis.angelaccio 2016-11-21 21:48:04 UTC
Created attachment 18586 [details]
WinForms hello.cs test app used to reproduce the issue

mono apps have an ugly mouse cursor when started from the KDE Plasma desktop. 

Steps to reproduce:

1. Login in a Plasma desktop
2. mcs hello.cs -pkg:dotnet
3. mono hello.exe

Actual result: 
Mouse cursor looks out of place and doesn't respect the gtk (adwaita) theme: http://i.imgur.com/D4isxCn.png

Expected result:
Mouse cursor should be from the adwaita theme, like the very same test app does on Gnome: http://imgur.com/a/FSE7N

This could be a Plasma bug, but I'm reporting it here first just to be sure.
Comment 1 elvis.angelaccio 2016-11-22 12:30:43 UTC
Interesting how the Gtk# hello world app is not affected: http://www.mono-project.com/docs/getting-started/mono-basics/#gtk-hello-world

With the app above I get the Plasma native mouse cursor, as expected: http://i.imgur.com/hcubueI.png
Comment 2 elvis.angelaccio 2016-11-22 12:50:35 UTC
I did more tests in the Enlightenment desktop, which like Plasma has a "native" mouse cursor theme. This is what happens:

* winform test app => cursor is not native, but at least falls back on the gtk adwaita cursor which is good enough

* gtk-sharp test app => cursor is native (same happens in Plasma)

So this could really be a bug from the Plasma side, which is only triggered in winforms apps.
Comment 3 elvis.angelaccio 2016-11-22 15:47:10 UTC
Further investigation with strace showed that the breeze theme (which provides the Plasma cursor) doesn't have a top_left_arrow cursor, which is what WinForms app look for. The adwaita theme instead has a top_left_arrow -> left_ptr symlink, hence why adwaita systems are not affected.

Fix in https://phabricator.kde.org/D3459