IDEA-67498 XSLT: changing value of version does not change XPath highlighting and completion until project reopening

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/context/XsltContextProviderBase.java

@@ -87,10 +87,20 @@ public abstract class XsltContextProviderBase extends ContextProvider {
   protected XsltContextProviderBase(XmlElement element) {
     final Project project = element.getProject();
     myFileAssociationsManager = FileAssociationsManager.getInstance(project);
-    myContextElement = SmartPointerManager.getInstance(project).createLazyPointer(element);
+    myContextElement = SmartPointerManager.getInstance(project).createSmartPsiElementPointer(element);
     attachTo(element);
   }
 
+  @Override
+  protected boolean isValid() {
+    return super.isValid() && matchContextType();
+  }
+
+  private boolean matchContextType() {
+    final PsiFile file = myContextElement.getContainingFile();
+    return file != null && XsltSupport.getXsltLanguageLevel(file).getXPathVersion() == getContextType().getVersion();
+  }
+
   private static void fillFromSchema(PsiFile file, ElementNames names) {
     if (!(file instanceof XmlFile)) return;
     final XmlFile f = (XmlFile)file;

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/XsltChecker.java

@@ -16,12 +16,23 @@
 
 package org.intellij.lang.xpath.xslt.impl;
 
+import org.intellij.lang.xpath.context.XPathVersion;
 import org.intellij.lang.xpath.xslt.XsltSupport;
 
 import com.intellij.util.xml.NanoXmlUtil;
 
 public class XsltChecker extends NanoXmlUtil.IXMLBuilderAdapter {
-    public enum LanguageLevel { NONE, V1, V2 }
+    public enum LanguageLevel { NONE(null), V1(XPathVersion.V1), V2(XPathVersion.V2);
+      private final XPathVersion myVersion;
+
+      LanguageLevel(XPathVersion version) {
+        myVersion = version;
+      }
+
+      public XPathVersion getXPathVersion() {
+        return myVersion;
+      }
+    }
 
     enum State {
         YES, SIMPLIFIED, NO, POSSIBLY, POSSIBLY_SIMPLIFIED_SYNTAX, VERSION2