[Improvement] Windows Screen Tearing

[wesbluemarine]

There is screen tearing when moving windows on my machine (intel graphics).
I solved with this line on kwinrc:

GLPreferBufferSwap=p

It's the "Full repaint" option on KDE, could afftect global performance on some machines.

[probonopd]

If we knew which GPUs are improved by this, we could possibly automate it (or initgfx could...)

[louies0623]

@probonopd I also have similar problem.
The driver that causes the problem.
Intel HD Graphics 530
Intel GMA 3150
Intel Sandy Bridge DT GT1
Intel Ivy Bridge DT GT1
Intel havendale/clarkdale processor - integrated graphics controller