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explicit repaint in highlight effect

forward port of 891a0a2a3272186c2c7a93f7a332e04809e3d4d4

This should help preventing flickering/tearing with various
ES drivers.
Thanks to Jammy Zhou for pointing out this problem and providing
the patch.
CCMAIL: jammy.zhou@linaro.org

This makes it possible to adjust both brightness and opacity
at the same time with one multiplication in the fragment shader.

mLocationsResolved wasn't being initialized in one of the constructors.

The alpha channel must be set to 1 before the sample is modulated
with the brightness and opacity constants, not after.

These are specialized overloads for setting the uniforms used
in the standard GLSL shaders in kwin.

This is a "dummy" merge (-s ours), keeping the tree just as it was
in master. Everything in 4.6 was verified to be already forward-ported
into master, so we're not losing anything.

The purpose of this merge is to allow doing useful merges
from 4.6 to master later without getting a ton of conflicts.

BUG: 263383

The complete HACKING file needs a rewrite...

Shortcuts for quick tile to the quarters of the screen
added in 4.6.
Thanks to Arthur Arlt for implementing this feature.
FEATURE: 265461
FIXED-IN: 4.7.0
CCMAIL: arre2000@gmx.de

Bug: 263383

BUG: 265131

fwd port of 04831d049f73bb38694d7cecc4ea170b2a26a149

forward port of 17934f79fa691a52efc4df142e5e8712634ad21a

BUG: 246442

the other whitespace...

BUG: 265272

This solves the regression with NVIDIA drivers resulting in a black screen.
Apparently NVIDIA does not support glXCopySubBuffer and the copying of pixels
fails with a shader bound.

So unbinding the shader before copying the pixels and rebinding the shader
afterwards resolves the issue.

This allows to remove the temporary hack to make NVIDIA work, again.

possibly prevents leaking ItemInfos
secure some accesses (selected_window), not sure whether this caused the unreproducable crash when used as proxy in coverswitch
manual fwd port of 84384efb52367e720ad82ace04ac8da668afc5ec

CCBUG: 253079

BUG: 265297

possibly prevents leaking ItemInfos
secure some accesses (selected_window), not sure whether this caused the unreproducable crash when used as proxy in coverswitch
CCBUG: 253079

KWin's new shaders fail with NVIDIA and present just a black screen
for the ortho shader (generic shader seems to work). Temporarily
disabling the shaders to force a fallback to old rendering code.

Of course the bug in the shader needs to be fixed.

Apparently glXQueryDrawable does not work in NVIDIA blob for binding
a texture from an icon. This fixes an abort, but the root cause should
be found and fixed properly.

Seems to be a lost change caused by rebasing moved code.

The RGB values were being multiplied by the alpha value twice.