added option to registry to enable search in project files

platform/lang-impl/src/com/intellij/find/impl/FindInProjectUtil.java

@@ -45,6 +45,7 @@ import com.intellij.openapi.ui.MessageType;
 import com.intellij.openapi.util.Computable;
 import com.intellij.openapi.util.Factory;
 import com.intellij.openapi.util.Pair;
+import com.intellij.openapi.util.registry.Registry;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.openapi.util.text.TrigramBuilder;
 import com.intellij.openapi.vcs.FileStatus;
@@ -235,7 +236,7 @@ public class FindInProjectUtil {
         long fileLength = getFileLength(virtualFile);
         if (fileLength == -1) continue; // Binary or invalid
 
-        if (ProjectUtil.isProjectOrWorkspaceFile(virtualFile)) continue;
+        if (ProjectUtil.isProjectOrWorkspaceFile(virtualFile) && !Registry.is("find.search.in.project.files")) continue;
 
         if (fileLength > SINGLE_FILE_SIZE_LIMIT) {
           largeFiles.add(psiFile);

platform/platform-resources-en/src/misc/registry.properties

@@ -104,6 +104,8 @@ psi.incremental.reparse.depth.limit=1000
 psi.viewer.selection.color=0,153,153
 psi.deferIconLoading=true
 
+find.search.in.project.files=false
+
 structureView.coalesceTime=500
 jar.build=false