JPS tests: support _dependencies.txt and _steps.txt for better files sorting

Original commit: 313c27859a

jps/jps-plugin/jps-tests/test/org/jetbrains/kotlin/jps/build/AbstractIncrementalJpsTest.kt

@@ -281,8 +281,15 @@ abstract class AbstractIncrementalJpsTest(
         get() = File(testDataDir, "dependencies.txt")
 
     private fun readModulesTxt(): ModulesTxt? {
-        if (!modulesTxtFile.exists()) return null
+        var actualModulesTxtFile = modulesTxtFile
-        return ModulesTxtBuilder().readFile(modulesTxtFile)
+
+        if (!actualModulesTxtFile.exists()) {
+            // also try `"_${fileName}.txt"`. Useful for sorting files in IDE.
+            actualModulesTxtFile = modulesTxtFile.parentFile.resolve("_" + modulesTxtFile.name)
+            if (!actualModulesTxtFile.exists()) return null
+        }
+
+        return ModulesTxtBuilder().readFile(actualModulesTxtFile)
     }
 
     protected open fun createBuildLog(incrementalMakeResults: List<AbstractIncrementalJpsTest.MakeResult>): String =
@@ -416,7 +423,7 @@ abstract class AbstractIncrementalJpsTest(
             TouchPolicy.TIMESTAMP
         )
 
-        val stepsTxt = File(testDataSrc, "steps.txt")
+        val stepsTxt = File(testDataSrc, "_steps.txt")
         val modificationNames = if (stepsTxt.exists()) stepsTxt.readLines() else null
 
         modifications.forEachIndexed { index, step ->

jps/jps-plugin/jps-tests/test/org/jetbrains/kotlin/jps/build/dependeciestxt/MppJpsIncTestsGenerator.kt

@@ -273,7 +273,7 @@ class MppJpsIncTestsGenerator(val txt: ModulesTxt, val testCaseDirProvider: (Tes
             }
 
         protected fun generateStepsTxt() {
-            File(dir, "steps.txt").setFileContent(steps.joinToString("\n"))
+            File(dir, "_steps.txt").setFileContent(steps.joinToString("\n"))
         }
 
         fun generateBaseContent() {