EA-46782 - IOOBE: SegmentArray.getSegmentStart
EA-42809 - CCE: RngDocumentationProvider.generateDoc
EA-38467 - NPE: XmlTagImpl.getDescriptor
Cleanup, performance
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Merge remote-tracking branch 'origin/master'

Conflicts:
	xml/relaxng/src/org/intellij/plugins/relaxNG/model/resolve/RelaxSymbolIndex.java
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
invalidate indices on PCE
Merge remote-tracking branch 'origin/master'
contents_changed produces children_changed event notification
EA-47221 - NPE: CompactSyntaxLexerAdapter.getSourceLocation - this is always caused by broken IDEA/JDK installations
Merge remote-tracking branch 'origin/master'