Bug 376589

Summary:	Layout destroyed after clicking link with HiDPI
Product:	[Applications] kmail2	Reporter:	Thiago Macieira <thiago>
Component:	message list	Assignee:	kdepim bugs <pim-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	faure
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	"Before" screenshot "After" screenshot

Description Thiago Macieira 2017-02-17 17:56:02 UTC

When clicking a link in an email in KMail, the message view layout is destroyed and cannot be recovered unless you close KMail's main window and open it again. This happens for *every* link, but only happens on HiDPI screens (QT_SCREEN_SCALE_FACTOR=2 or higher).

This has been happening since the switch to QtWebEngine. It has never worked with it.

Steps to reproduce:
1) close kmail (killall kmail to be sure)
2) from a terminal, open kmail in HiDPI mode: QT_SCREEN_SCALE_FACTOR=2 kmail
3) select an email that has a web link
4) click it

Expected results:
Browser opens and KMail window remains as it was before clicking the link (see "before" screenshot)

Actual results:
Browser opens, but KMail window layout is destroyed (see "after" screenshot).

Comment 1 Thiago Macieira 2017-02-17 17:56:30 UTC

Created attachment 104078 [details]
"Before" screenshot

Comment 2 Thiago Macieira 2017-02-17 17:56:48 UTC

Created attachment 104079 [details]
"After" screenshot

Comment 3 David Faure 2017-02-20 08:56:42 UTC

I was able to reproduce the same bug in webengine's demobrowser, so it's a Qt bug.


https://bugreports.qt.io/browse/QTBUG-59017

Comment 4 David Faure 2017-04-04 06:32:47 UTC

Note: if `kcmshell5 componentchooser` says the webbrowser is firefox, the bug doesn't happen.
If OTOH it says "based on the contents of the URL" (i.e. KMail uses KIO), then the bug happens.

That's a workaround for now, and an indication that something in KIO is triggering it.