Commit graph

15362 commits

Author SHA1 Message Date
Martin Flöser
139b4dc82a Properly swap the quick tile side when pressing the shortcut again
Summary:
The quick tile shortcuts have a feature of moving the window to the next
screen if one presses the same shortcut again.
E.g. if a window is quick tiled to the left on the right most screen,
quick tile again to left should move it to the left screen and quick tile
right. Thus it swaps the borders.

This wasn't handled correctly, especially not for modes like top and
bottom. If a window is quick tiled to the top an impossible mode was
generated: Left | Right. Doesn't make sense.

This change fixes the mode swapping and extends our quick tile testing
to cover the situation.

BUG: 382313
FIXED-IN: 5.10.4

Test Plan: Extended test case

Reviewers: #plasma, #kwin

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6708
2017-07-17 16:51:31 +02:00
Martin Flöser
5cb91762be [aurorae] Mark the render QQuickWindow as frameless
Summary:
On Wayland aurorae was creating a lot of stress for the system and
basically turning the system unusable in a short time. This was due to
a recursion starting to create OpenGL contexts. The window created a
decoration (aurorae) which created a QQuickWindow. For that KWin creates
an internal window which in turn triggers the creation of a window
decoration and so on and on.

By simply setting the render QQuickWindow as frameless we can prevent
this recursion.

Test Plan: Tested on Wayland and X11. On Wayland the recursion is gone.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6726
2017-07-17 16:51:04 +02:00
Martin Flöser
06a558e3de [platforms/x11] Quit the OpenGL Freeze protection thread on shutdown
Summary:
Weird NVIDIA behavior fixup part 2. Now that we do no longer freeze when
NVIDIA decides to create an OpenGL error on startup
(aefb5f4dd9), we experience a new issue.
KWin is terminating (no idea why, [1]) and at the same time the OpenGL freeze
protection thread is still running. So far we did not terminate the
thread on shutdown and thus we hit an abort in Qt.

This change ensures that we properly terminate the thread on shutdown.

[1] My current theory is that games terminate KWin, common pattern of
bug reports is "steam".

BUG: 382283
FIXED-IN: 5.10.4

Test Plan:
Tortured KWin by making sure I go through the code path,
saw the abort without the patch, no more abort with the patch

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6735
2017-07-16 18:04:17 +02:00
l10n daemon script
47f414b6d5 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-07-07 05:51:38 +02:00
Martin Flöser
962a2e39ee [qpa] Prevent crash due to Surface getting null
Summary:
This is a regression due to changes in Breeze to support Qt 5.8+ behavior
change. KWin's own QPA operates like < Qt 5.7 and breeze was programmed
against that. Due to that it can happen now that Breeze hits code paths
in which KWin does not have a surface.

To trigger one only needed to open the user actions menu twice.

This change adds a test case which simulates the problem and fixes all
crashes happening in the code path.

Most likely shadows are now broken for KWin's own windows, this change is
only to prevent the crash and thus is for 5.10 branch, while shadow
fixing will go to master branch.

BUG: 382063
FIXED-IN: 5.10.4

Test Plan: New test case

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6533
2017-07-06 19:14:15 +02:00
Martin Flöser
4e9456a857 [platforms/x11] Fix incorrect screen edge approaching with switch desktop on window move
Summary:
There is a regression in WindowBasedEdge::soStopApproaching. Due to
only operate when the edge activates for pointer it is possible that
the cursor polling stays active. Explaining the situation:

1. Activate switch desktop when moving window
2. Start moving a window
3. Move mouse into the approach geometry
-> doStartApproaching activates as we are moving a window
4. stop moving window
-> doStopApproaching early exits as the position does not activate for
   pointer any more - we are not moving a window
-> cursor polling is still connected and whenever mouse enters edge
   approaching is started

The analysis shows that the check whether activates for pointer is wrong
in the case of stop approaching. If the edge started to approach, we also
need to stop approaching.

This change addresses the problem by turning the check into whether the
connection for cursor position update is set.

This is the third bug fix to the X11 screen edge handling after
introducing touch screen edges. This needs more manual testing by
everybody in the Plasma team who is still using X11.

BUG: 381849
FIXED-IN: 5.10.4

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6467
2017-07-06 19:12:28 +02:00
Martin Flöser
24ff93854d [effects/slideback] Ignore windows which are not in visible area
Summary:
The PresentWindows effect does not hide the window to close the selected
window. Instead it moves it outside the visible area. As this is a
"special" KWin window it is on top of the stacking order and needs to be
ignored in the slideback effect.

Instead of doing a special casing for this window the effect is changed
to ignore windows outside the visible area in general. Windows outside
the visible area just don't make sense to block the slideback effect.

BUG: 381402
FIXED-IN: 5.10.4

Test Plan: Slideback works after using Present Windows effect

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6468
2017-07-06 19:12:06 +02:00
Martin Gräßlin
aefb5f4dd9 Prevent endless loop in checkGLError due to GL_CONTEXT_LOST
Summary:
The GL_CONTEXT_LOST flag is not reset when calling glGetError. This of
course bites with: "Thus, glGetError should always be called in a loop,
until it returns GL_NO_ERROR, if all error flags are to be reset."
(see https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glGetError.xhtml)

As KWin calls checkGLError from init call it can result in a freeze of
KWin. This is a regression reported multiple times since the release of
5.10.3 which enabled GLX_NV_robustness_video_memory_purge extension.

Please note that I am not able to test this change. I do not have an
NVIDIA card and are not hiting the problem. I have no way to simulate
the code. I do not know whether the change will fix the problem, it is
based on what others do. Inspiration for this change is mostly from
mutter: https://git.gnome.org/browse/mutter/commit/?id=d4d2bf0f6c1737256b921c4f1dedd3a95138cab9

BUG: 381870
FIXED-IN: 5.10.3.1

Test Plan: See above, I can only compile check the change

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6464
2017-07-01 19:28:31 +02:00
Martin Flöser
113be5fac8 Restore active client after ending showing desktop
Summary:
Showing desktop requests focus on the desktop window. This means the
active window is reset. When ending showing desktop the state was not
restored.

This change addresses this problem by requesting focus to the best
window.

BUG: 375993
FIXED-IN: 5.10.4

Test Plan: New autotest and manual testing

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6420
2017-07-01 08:20:01 +02:00
Martin Flöser
43816119e9 Skip Shader self test for Mesa >= 17
Summary:
We are getting reports about the shader self test failing in a false
positive way on Mesa 17. We already have such false positve results
for NVIDIA quadro and went with disabling the self test.

Most likely our self test has a problem or the rendering of the first
frame has a problem. But disabling compositing because our rendering of
the first frame is broken, is too much.

Let's better be pro user here and disable the shader self test till we
fixed the root problem.

BUG: 376801
FIXED-IN: 5.10.4

Test Plan: It compiles.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6426
2017-07-01 08:19:31 +02:00
l10n daemon script
07259cfa59 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-06-28 09:36:23 +02:00
Jonathan Riddell
f4b407dbe0 Update version number for 5.10.3
GIT_SILENT
2017-06-27 10:15:39 +01:00
Martin Flöser
6267d59731 Properly block the edge also for touch screen edges
Summary:
There was a regression introduced with bug fix eec6afe6 which added
a for pointer events only check also to doUpdateBlocking. Do to that
the edge blocking mechanism didn't work for touch edges.

BUG: 380476
FIXED-IN: 5.10.3

Test Plan:
verified with xwininfo that there is no longer a window when
in full screen. Activated edges through touch and pointer

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6304
2017-06-26 22:06:12 +02:00
Martin Flöser
97fa72ee48 [platforms/x11] Add support for GLX_NV_robustness_video_memory_purge
Summary:
Based on earlier phab-request D2079. Adds the nvidia memory purge
extension to the robust context creation.

BUG: 344326
FIXED-IN: 5.10.3

Test Plan: Only compile tested as I don't have an NVIDIA card.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6344
2017-06-26 22:05:28 +02:00
l10n daemon script
3deb48b252 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-06-25 05:43:31 +02:00
l10n daemon script
8765f5b4c3 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-06-23 05:46:51 +02:00
Martin Flöser
152be60cc0 Fix double click on window deco if tripple clicked
Patch by Thomas Lübking which got lost in bugs.kde.org.

BUG: 361241
FIXED-IN: 5.10.3
2017-06-22 07:07:06 +02:00
David Edmundson
b7cb301deb Make shadows work for windows 100% width or height
Summary:
Clients provide shadows as 9 images, which then get split into relevant quads.
To work out the full width we need the size of an item on the left, the middle and the right.

Some elements can be legitiamtely missing so to work out the width of the left edge we need to consider
all 3 of topleft,left,bottomleft.

Currently we checked both corners in case one was missing, but it's legitimate for both to be missing if the shadow
stretches the whole way.

BUG: 380825

Test Plan: Shadow on panel, rest looks the same

Reviewers: #plasma, mart

Reviewed By: #plasma, mart

Subscribers: graesslin, mart, plasma-devel, kwin, #kwin

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D6164
2017-06-20 15:48:41 +01:00
Martin Flöser
3b9ccc65a3 [tabbox] Fix casts to Client where it should be AbstractClient
Summary:
A few areas in TabBox perform casts from Toplevel to Client. By casting
to Client instead of AbstractClient the Wayland windows are excluded.

This change addresses the problem by changing the casts where possible.
The only remaining cast to Client is for shading which is not (yet)
supported for Wayland windows anyway.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6273
2017-06-20 07:07:44 +02:00
Martin Flöser
7a3c292612 Fix switch desktop on screenedge while resizing a Wayland window
Summary:
Screenedges only allows to switch desktop while moving window, not
while resizing. There was a special branch which only checked this for
X11 windows but not for Wayland windows.

This change removes a no longer needed cast from AbstractClient to Client
so that the check whether a window is getting resized works for both
X11 and Wayland clients. The cast was introduced in a time when
AbstractClient did not yet support the isResize method.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D6264
2017-06-20 06:58:03 +02:00
Martin Flöser
c45e165514 Fix switch desktop through edge when moving window
Summary:
There was a regression introduced in ScreenEdges when introducing the
activatesForPointer method. It considered the switch desktop on edge,
but not the special case of switch desktop when moving windows. Due to
that the edges did not activate when moving the window.

This change addresses the regression and extends the autotest to ensure
it's properly covered.

BUG: 380440
FIXED-IN: 5.10.3

Test Plan: Manual testing and extended auto test

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6257
2017-06-20 06:57:33 +02:00
Martin Flöser
a6dee74ee4 Workaround Qt regression of no longer delivering events for the root window
Summary:
With qtbase 2b34aefcf02f09253473b096eb4faffd3e62b5f4 we do no longer get
events reported for the X11 root window. Our keyboard handling in effects
like PresentWindows and DesktopGrid relied on that.

This change works around the regression by calling winId() on
qApp->desktop() as suggested in the change. This is a short term solution
for the 5.10 branch.

This needs to be addressed properly by no longer relying on Qt in this
area. KWin already does not rely on Qt for Wayland in that area and is
able to compose the QKeyEvents. This should also be done on X11. It just
needs some more hook up code for xkb, but that's needed anyway to improve
modifier only shortcuts and friends.

BUG: 360841
FIXED-IN: 5.10.3

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6258
2017-06-20 06:56:52 +02:00
Martin Flöser
0df09a8cbb Better handle cases when the xkb keymap fails to be created
Summary:
If the keymap cannot be created a few pointers in Xkb are null.
We should make sure to not call any xkbcommon functions on those
null pointers and instead use proper fallbacks.

This change introduces fixes for a few usages, but it's not unlikely
that there are more cases.

BUG: 381210
FIXED-IN: 5.10.3

Test Plan:
Autotest added for the condition of the bug, which does
not crash any more. Just starting the test found a few more crash
cases.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6260
2017-06-18 21:04:58 +02:00
Jonathan Riddell
cfe13c5a4f Update version number for 5.10.2
GIT_SILENT
2017-06-13 18:31:37 +01:00
l10n daemon script
1680a4e9eb SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-06-13 05:58:57 +02:00
l10n daemon script
1112188a8b SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-06-10 05:41:19 +02:00
Jonathan Riddell
6d9a7142e5 Update version number for 5.10.1
GIT_SILENT
2017-06-06 11:42:40 +01:00
David Edmundson
5091feb8f6 Fix Aurorae decorations with non integer DPI
Summary:
As noted by Thomas L we're casting the scaleFactor to an int far too
early, which in the worst case means we end up with Aurorare themes not
rendering.

This moves the rounding to where it's used per border.

BUG: 380524

Test Plan:
Forced Xft.DPI to 95 with xrdb. Confirmed that it was broken
Applied this patch. Got decoration again

Reviewers: #plasma, mart

Reviewed By: #plasma, mart

Subscribers: mart, rikmills, plasma-devel, kwin, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D6099
2017-06-05 10:50:01 +01:00
l10n daemon script
85ede03a57 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-06-04 05:39:14 +02:00
Jonathan Riddell
c5861b99eb Update version number for 5.10.0
GIT_SILENT
2017-05-25 19:30:36 +01:00
l10n daemon script
2a6048c885 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-25 05:40:47 +02:00
l10n daemon script
67ab6d9b31 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-23 05:54:25 +02:00
l10n daemon script
0f66fa648f SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-22 05:32:13 +02:00
l10n daemon script
30113e72b7 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-14 05:28:03 +02:00
David Faure
bddde8d78e Fix compilation without libinput. #if is used everywhere else, #ifdef is wrong. 2017-05-13 12:05:33 +02:00
l10n daemon script
2281bd19d8 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-13 05:59:44 +02:00
Martin Flöser
6a4e9cbb58 Merge branch 'Plasma/5.9' into Plasma/5.10 2017-05-12 07:08:04 +02:00
Martin Gräßlin
229be65e40 Improve the escape key handling for breaking constrained pointers
Summary:
So far KWin started to filter out the escape key as soon as it gets
pressed. This was done by unsetting keyboard focus. The idea was to
reset keyboard focus when it is only a short press and that then the
keyboard state is correct for the application. But in practice this
does not work. The only application currently supporting pointer
constraints (Xwayland) does not do anything on a key which is pressed
when gaining keyboard focus. The result is escape not working in
pointer constrained Xwayland windows.

This change addresses this problem by changing the interaction to only
unset keyboard focus when our break constraints condition is met. This
should also result in the application not handling the key release, but
it means it gets the key press. Unfortunately I don't have a good way
to test.

BUG: 378452

Test Plan: None

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5488
2017-05-12 07:06:44 +02:00
l10n daemon script
7a14a0ef4d SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-12 05:44:57 +02:00
Roman Gilg
9334d0ac48 [DRM plugin] No forward declare of DrmSurfaceBuffer without GBM
This fixes a compilation error introduced with efedddd905, which
forward declared the DrmSurfaceBuffer class also on builds without GBM.

BUG: 379732
2017-05-11 23:53:24 +02:00
Eike Hein
6607bd72f2 Use resourceClass as fallback for XWayland clients instead of resourceName.
Summary:
resourceClass is the more useful half of WM_CLASS. It's what modern X
clients are supposed to set to a .desktop file name, which is closer to
the semantics of appId than resourceName.

Reviewers: #plasma, graesslin

Subscribers: kwin, plasma-devel, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5815
2017-05-12 02:18:44 +09:00
Jonathan Riddell
6d1b61c1a7 Update version number for 5.9.95
GIT_SILENT
2017-05-11 14:38:49 +01:00
David Edmundson
e63a25515a List both setup and monitor UUIDs in debug
Summary:
I keep having to re-add this patch locally to see which config is
actually in play.

Test Plan: Compiles

Reviewers: #plasma, graesslin

Reviewed By: #plasma, graesslin

Subscribers: plasma-devel, kwin, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5795
2017-05-11 12:08:03 +02:00
l10n daemon script
1d8b61deb4 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-11 04:19:45 +02:00
Rohan Garg
3817eddfc6
m_clientSize is already connected in ShellClient::init
Summary:
TODO no longer applies since ShellClient::init already connects
SurfaceInterface::sizeChanged to update m_clientSize

Test Plan

Subscribers: kwin, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5787
2017-05-10 10:52:19 +02:00
l10n daemon script
52b21b1142 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-10 08:51:09 +02:00
l10n daemon script
9ad87d3909 SVN_SILENT made messages (.desktop file) - always resolve ours
In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"
2017-05-10 07:42:38 +02:00
Roman Gilg
d15cb52682 [DRM plugin] Correct Atomic Mode Setting
This patch makes the AMS execution path work with the new DrmCrtc and
DrmBuffer structure and solves major issues about:
* VT switching
* DPMS
* Hot plugging
* Logout
* Memory leaks

Test Plan:
Tested with Gl and QPainter.

Reviewers: #kwin

Subscribers: kwin, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5191
2017-05-09 21:29:10 +02:00
Roman Gilg
efedddd905 [DRM plugin] Reorganize DrmBuffer
Split off GBM based buffers to a separate file, which gets only included,
when GBM is available.

Note, that this also removes the gbmCallback, since already before this
patch we did delete the buffers always without it.

The plan is to later use this file for via GBM directly imported Wayland
buffers as well.

Test Plan:
Tested with Gl and QPainter backends.

Reviewers: #kwin

Subscribers: kwin, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5179
2017-05-09 21:00:33 +02:00
Roman Gilg
a0571ccf84 [DRM plugin] Remember static kernel objects, amplify use of DrmCrtc
To get an image from KWin to the screen in the DRM pipeline we combine a CRTC,
an encoder and a connector. These objects are static in the sense, that they
represent real hardware on the graphics card, which doesn't change in a
session. See here for more details:
https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-kms.html

Until now we used DrmOutput as the main representation for such an active
rendering pipeline. I.e. it gets created and destroyed on hot plug events of
displays. On the other side we had no fixed representation of the static kernel
objects throughout the lifetime of KWin. This has several disadvantages:
* We always need to query all available static objects on an hot plug event.
* We can't manipulate the frame buffer of a CRTC after an output has been
  disconnected
* Adding functionality for driving multiple displays on a single CRTC (i.e.
  cloning) would be difficult
* We can't destroy the last frame buffer on display disconnect because the CRTC
  still accesses it and have therefore a memory leak on every display disconnect

This patch  solves these issues by storing representations of all available CRTC
and Connector objects in DrmBackend on init via DrmCrtc and DrmConnector
instances. On an hotplug event these vectors are looped for a fitting CRTC and
Connector combinations. Buffer handling is moved to the respective CRTC
instance. All changes in overview:
* Query all available CRTCs and Connectors and save for subsequent hotplug
  events
* Fix logic errors in `queryResources()`
* Move framebuffers, buffer flip and blank logic in DrmCrtc
* Remove `restoreSaved()`. It isn't necessary and is dangerous if the old
  framebuffer was deleted in the meantime. Also could reveal sensitive user
  info from old session.

Test Plan:
Login, logout, VT switching, connect and disconnect external monitor, energy
saving mode.

Reviewers: #kwin

Subscribers: kwin, #kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D5118
2017-05-09 20:23:43 +02:00