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This makes empty tags available again.

This code is broken: it causes tags to be written multiple times to
the tag store. However, disabling it is a Bad Thing, because now two
instance of krita will happily overwrite each other's tag store.

Now when the source image is changed we use an iterational algorithm
which is usually applied to a SeqLock problem:

1) Save the size and lastModified tag of the image
2) Copy the image to the temporary directory
3) Check whether the image has changed during the copy operation
4) If everything is ok load the image from a temporary copy. If not,
   restart.

BUG:325686

No " Tool" suffix, and no English Title Names.

REVIEW: 114434

CCBUG:325291

It's not really an interface class, so the name was a bit confusing.
I spent quite a bit of time trying to track down the classes implementing
the interface :-)

fixes ftbfs on arm platforms where qreal=float

That should move it out of the way of most desktop panels.

Patch by David Revoy. Thanks!

CCMAIL:davidrevoy@gmail.com

1) The size of the data stored in the patch does not contain the border
2) The exponent of the border formula should be exactly the number of
   mipmal levels

BUG:327162

The borders should be as wide as needed, but not just 1px

BUG:327162

Special thanks to Anton Saraev for preparing initial patch for the bug!

Node Manager is one of few places in Krita which are not ported to
strokes yet and continues to use KisLegacyUndoAdapter. Ideally its
actions should run asynchronously using KisProcessingsApplicator,
but for now we will just check whether the node is locked or not.

BUG:328617

The openGL context should be initialized at least once in the beginning.

This surely fixes:
BUG:328649

Please check whether these bugs are fixed now:
CCBUG:327684
CCBUG:328627

X11 does not seem to suffer from the same issue with sharing contexts,
so don't switch contexts constantly as that is a very expensive
operation.

BUG:328358

BUG:328390

BUG:328630

This reverts commit 14b61cf42a6dcc291ba6fc617f106fc4d92da8e8.

See this Qt bug:
https://bugreports.qt-project.org/browse/QTBUG-25329

Calling of makeCurrent() in paintGL() is excessive, because it is
automatically done by the Qt before the paintGL call.

There is still (another) crash when switching QPainter->openGL

Even when activated with a shortcut, it's better to open the palette
as close to the cursor as possible.

The default was the xml-file backend. The nepomuk ingegration was
basically unused, and having everyone use the same backend makes
support a lot easier.

CCBUG:325291

CCBUG:318024

BUG:318024

Making the window resizable is not quite feasible, but this
implements most of what was left for bug 318024.

BUG:326759

BUG: 328648

BUG:312111

This functionality somehow got lost after the port to Qt4.

This flag wasn't checked anywhere anymore, but still set in a bunch
of places.

Unless we're the preset editor...

BUG:327977