Bug 346020

Summary:	Cannot release docker if undocking with no document opened, must Alt+F4 to escape
Product:	[Applications] krita	Reporter:	Tyson Tan <tysontanx>
Component:	Usability	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	halla
Priority:	NOR
Version First Reported In:	2.9
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Tyson Tan 2015-04-09 12:40:06 UTC

When no document is opened and I undock a docker, I will be stuck in the repositioning process. I cannot release the docker. It will follow my cursor in/outside the window. I can do nothing except hitting Alt+F4 to get out of this situation.

Reproducible: Always

Steps to Reproduce:
1. Open Krita;
2. Do not open document;
3. Undock Layers docker by dragging its title;

Actual Results:  
The docker gets undocked, but it cannot be released and follow the mouse forever. I cannot click anything.

Expected Results:  
You cannot undock anything without opening a document first.

Comment 1 Halla Rempt 2015-04-16 09:39:42 UTC

Hi Tyson!

Which window manager are you using? I don't get this problem with either KDE or Gnome 3 -- the dragging of dockers is also something implemented in Qt and the Window manager, not KDE, so we can't really influence the behaviour.

Comment 2 Tyson Tan 2015-04-16 12:54:22 UTC

Hi Boud.

My current settings:
* Window manager: Compiz (1:0.9.11.3+14.04.20150122-0ubuntu1) 
* Desktop environment: Gnome Fallback (3.8.x~3.10.x)

Trisquel 7 default:
* Window manager: Compton (0.1~beta2-1+7.0trisquel4). 
* Desktop environment: Gnome Fallback (3.8.x~3.10.x)

Notes:
* Compton lacks window snapping so I switched to Compiz. Compiz is also responsible for not focusing on the splash but the main window after startup.
* Trisquel 7 has customized Gnome components, probably theme/pre-configuration related. The version numbers are roughly the same as Ubuntu 14.04 LTS (which is a nightmarish mix of 3.8.x~3.10.x).
* I can reproduce this bug using metacity (1:2.34.13-0ubuntu4) as my window manager. metacity is the fallback default for all Gnome. It returns something like this when run from the console: “$metacity --replace >> Window manager warning: Invalid WM_TRANSIENT_FOR window 0x4000004 specified for 0x40000bb (krita)”.
* If a docker is already floating on startup, I cannot drag it unless I open a document. However, the docked ones can still be dragged to undock. Once undocked, they follow my cursor and grab all my mouse events.

Comment 3 Halla Rempt 2015-04-18 09:28:08 UTC

Yes, that makes it pretty certain that it's either a Qt bug, or a Window manager bug. We just can't do anything about the window manager flags for floating dockers from Krita, I'm afraid.

Comment 4 Tyson Tan 2015-04-20 03:36:59 UTC

A new finding:
This can be only triggered by stylus. Mouse works fine.

Workaround:
When using stylus to trigger this bug, you can use another pointing device (mouse) to release the docker.