WEB-25750 Intentions: restore "Check RegExp" action

plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/AbstractLanguageInjectionSupport.java

@@ -56,6 +56,11 @@ public abstract class AbstractLanguageInjectionSupport extends LanguageInjection
     return false;
   }
 
+  @Override
+  public boolean useDefaultCommentInjector() {
+    return true;
+  }
+
   @Nullable
   @Override
   public BaseInjection findCommentInjection(@NotNull PsiElement host, @Nullable Ref<PsiElement> commentRef) {

plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/CommentLanguageInjector.java

@@ -63,6 +63,8 @@ public class CommentLanguageInjector implements MultiHostInjector {
       if (support == myInjectorSupport && applicableFound) continue;
       applicableFound = true;
 
+      if (!support.useDefaultCommentInjector())
+        continue;
       BaseInjection injection = support.findCommentInjection(host, null);
       if (injection == null) continue;
       if (!InjectorUtils.registerInjectionSimple(host, injection, support, registrar)) continue;

plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/LanguageInjectionSupport.java

@@ -57,6 +57,8 @@ public abstract class LanguageInjectionSupport {
 
   public abstract boolean useDefaultInjector(PsiLanguageInjectionHost host);
 
+  public abstract boolean useDefaultCommentInjector();
+
   @Nullable
   public abstract BaseInjection findCommentInjection(@NotNull PsiElement host, @Nullable Ref<PsiElement> commentRef);