Content Assist (Ctrl + Space) Is not working for testNG.xml file in eclipse - testng-eclipse

Content Assist (Ctrl + Space) is not working in Eclipse IDE for testng.xml .
Eclipse Version: Photon Release (4.8.0)

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When I installed Eclipse to write java programs, I found the feature of shortcut coding (CTRL + space) doesn't work popping up error message, giving that Eclipse version is Neon.3 Release (4.6.3)

my eclipse splits editor windows automatically, it's extremely annoying for me.

Does anybody know how to disable this auto-splitting?
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Eclipse IDE for Java Developers
Version: Oxygen.1a Release (4.7.1a)
"
Please see the image Windows==>Editor==>Toggle split Editor.

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I finally found the issue.
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thanks
The easiest way to know where the PyDev debugger is located is by opening a PyDev editor, writing pydevd and requesting a code completion just showing the templates (ctrl space twice)... A template for creating a programmatic breakpoint will be shown (and it adds the debugger to the PYTHONPATH, so you can see where it's located).