Fix issue # 366

[feketeimre]

Set the right texture for rendering, otherwise a previously set texture is overwritten.

[codecov-io]

Codecov Report

Merging #626 into develop will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop     #626      +/-   ##
===========================================
- Coverage    36.83%   36.82%   -0.02%     
===========================================
  Files          198      198              
  Lines        27088    27090       +2     
  Branches      4458     4458              
===========================================
- Hits          9978     9975       -3     
- Misses       16252    16256       +4     
- Partials       858      859       +1

Impacted Files	Coverage Δ
pyqtgraph/opengl/items/GLScatterPlotItem.py	14.63% <0%> (-0.19%)	⬇️
pyqtgraph/opengl/GLViewWidget.py	19.73% <0%> (-0.07%)	⬇️
pyqtgraph/multiprocess/remoteproxy.py	57.14% <0%> (-0.56%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e65ab3f...8d9cb79. Read the comment docs.

[campagnola]

I wasn't able to reproduce the problem (which is not surprising; opengl drivers have widely inconsistent implementations). However your explanation makes perfect sense, so: merge!
Thanks for all the detail.