Allow to edit non-JPS build logs in "Show difference" window for non-JPS IC tests

build-common/test/org/jetbrains/kotlin/incremental/testingUtils/BuildLogFinder.kt

@@ -28,6 +28,9 @@ data class BuildLogFinder(
         private const val GRADLE_LOG = "gradle-build.log"
         private const val DATA_CONTAINER_LOG = "data-container-version-build.log"
         private const val SIMPLE_LOG = "build.log"
+
+        fun isJpsLogFile(file: File): Boolean =
+                file.name.let { it == SIMPLE_LOG || it == DATA_CONTAINER_LOG }
     }
 
     fun findBuildLog(dir: File): File? {

compiler/incremental-compilation-impl/test/org/jetbrains/kotlin/incremental/AbstractIncrementalCompilerRunnerTestBase.kt

@@ -81,7 +81,13 @@ abstract class AbstractIncrementalCompilerRunnerTestBase<Args : CommonCompilerAr
         }
 
         if (expectedSBWithoutErrors.toString() != actualSBWithoutErrors.toString()) {
-            Assert.assertEquals(expectedSB.toString(), actualSB.toString())
+            if (BuildLogFinder.isJpsLogFile(buildLogFile)) {
+                // JPS logs should be updated carefully, because standalone logs are a bit different (no removed classes, iterations, etc)
+                Assert.assertEquals(expectedSB.toString(), actualSB.toString())
+            }
+            else {
+                UsefulTestCase.assertSameLinesWithFile(buildLogFile.canonicalPath, actualSB.toString(), false)
+            }
         }
 
         // todo: also compare caches