New J2K: commit file after each post-processing

#KT-31809 fixed

nj2k/nj2k-services/src/org/jetbrains/kotlin/nj2k/postProcessing/J2kPostProcessor.kt

@@ -7,17 +7,20 @@ package org.jetbrains.kotlin.nj2k.postProcessing
 
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.ModalityState
+import com.intellij.openapi.command.CommandProcessor
 import com.intellij.openapi.editor.RangeMarker
 import com.intellij.psi.PsiElement
 import com.intellij.psi.search.LocalSearchScope
 import com.intellij.psi.search.searches.ReferencesSearch
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withContext
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.diagnostics.DiagnosticWithParameters2
 import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.caches.resolve.resolveImportReference
 import org.jetbrains.kotlin.idea.core.util.EDT
+import org.jetbrains.kotlin.idea.formatter.commitAndUnblockDocument
 import org.jetbrains.kotlin.idea.inspections.*
 import org.jetbrains.kotlin.idea.inspections.branchedTransformations.IfThenToSafeAccessInspection
 import org.jetbrains.kotlin.idea.inspections.conventionNameCalls.ReplaceGetOrSetInspection
@@ -59,6 +62,17 @@ class NewJ2kPostProcessor : PostProcessor {
         runBlocking(EDT.ModalityStateElement(ModalityState.defaultModalityState())) {
             for (processing in processings) {
                 processing.runProcessing(file, rangeMarker, converterContext as NewJ2kConverterContext)
+                commitFile(file)
+            }
+        }
+    }
+
+    private suspend fun commitFile(file: KtFile) {
+        withContext(EDT) {
+            CommandProcessor.getInstance().runUndoTransparentAction {
+                runWriteAction {
+                    file.commitAndUnblockDocument()
+                }
             }
         }
     }