diff --git a/Build/Changes.txt b/Build/Changes.txt
index aebaad4f1..96a9dde10 100644
--- a/Build/Changes.txt
+++ b/Build/Changes.txt
@@ -33,7 +33,7 @@ UCD - (UCD)ARDET is an Encoding Detector Library
 
 
 ========================================================
-Current BETA/RC Version 5.21.417.(build_#) (2021-04-17)
+Current BETA/RC Version 5.21.419.(build_#) (2021-04-19)
 ========================================================
 
 --------------------------------------------------------
@@ -60,6 +60,8 @@ NEW:
 CHANGES:
 --------------------------------------------------------
 [.###.#]- .
+[.419.1]- Move some Lexer related functions to other module.
+[.419.1]- Enable compiler warnings level 4 and issue "Warnings as Errors" (for Lexilla, Scintilla, grepWinNP3).
 [.417.1]- Remove short-note from wrap around match tooltip.
 [.416.1]- Save bookmarks in file history in case of "Save as...".
 [.416.1]- Minimize usage of deprecated LCID/LANGID for MiniPath.
@@ -96,6 +98,9 @@ CHANGES:
 FIXES:
 --------------------------------------------------------
 [.###.#]- .
+[.419.1]- Apply provided Scintilla patch.
+[.419.1]- Stream comment for .AU3 files.
+[.419.1]- "grepWinNP3": fix compiler warning Release Win32 (GRE).
 [.416.2]- Workaround Scintilla text-rendering bug, if line-number margin width set to 0 (so use 1 instead).
 [.416.1]- Save Schema config in case of inifile from scratch.
 [.415.1]- Small correction to Line Cut feature (thin selection).
diff --git a/Versions/day.txt b/Versions/day.txt
index 53c86ff4f..7b53aa000 100644
--- a/Versions/day.txt
+++ b/Versions/day.txt
@@ -1 +1 @@
-417
+419
diff --git a/res/Notepad3.exe.manifest.conf b/res/Notepad3.exe.manifest.conf
index 51fd23c4f..d44405353 100644
--- a/res/Notepad3.exe.manifest.conf
+++ b/res/Notepad3.exe.manifest.conf
@@ -3,7 +3,7 @@
   <assemblyIdentity
     name="Notepad3"
     processorArchitecture="*"
-    version="5.21.417.1"
+    version="5.21.419.1"
     type="win32"
   />
   <description>Notepad3 beta</description>
diff --git a/src/VersionEx.h b/src/VersionEx.h
index 0c53d526e..3f533955d 100644
--- a/src/VersionEx.h
+++ b/src/VersionEx.h
@@ -8,7 +8,7 @@
 #define SAPPNAME "Notepad3"
 #define VERSION_MAJOR 5
 #define VERSION_MINOR 21
-#define VERSION_REV 417
+#define VERSION_REV 419
 #define VERSION_BUILD 1
 #define SCINTILLA_VER 501
 #define LEXILLA_VER 501
diff --git a/test/test_files/StyleLexers/styleLexKotlin/CommandLine (issue #3343).kt b/test/test_files/StyleLexers/styleLexKotlin/CommandLine (issue #3343).kt
new file mode 100644
index 000000000..18e441f2b
--- /dev/null
+++ b/test/test_files/StyleLexers/styleLexKotlin/CommandLine (issue #3343).kt	
@@ -0,0 +1,175 @@
+/*
+ * Use of this source code is governed by the MIT license that can be
+ * found in the LICENSE file.
+ */
+
+package org.rust.cargo.toolchain
+
+import com.intellij.execution.ProgramRunnerUtil
+import com.intellij.execution.RunManagerEx
+import com.intellij.execution.RunnerAndConfigurationSettings
+import com.intellij.execution.configuration.EnvironmentVariablesData
+import com.intellij.execution.executors.DefaultRunExecutor
+import org.rust.cargo.project.model.CargoProject
+import org.rust.cargo.project.model.cargoProjects
+import org.rust.cargo.project.workspace.CargoWorkspace
+import org.rust.cargo.runconfig.command.workingDirectory
+import org.rust.cargo.runconfig.createCargoCommandRunConfiguration
+import org.rust.cargo.runconfig.wasmpack.WasmPackCommandConfiguration
+import org.rust.cargo.runconfig.wasmpack.WasmPackCommandConfigurationType
+import org.rust.stdext.buildList
+import java.io.File
+import java.nio.file.Path
+
+abstract class RsCommandLineBase {
+    abstract val command: String
+    abstract val workingDirectory: Path
+    abstract val redirectInputFrom: File?
+    abstract val additionalArguments: List<String>
+
+    protected abstract fun createRunConfiguration(runManager: RunManagerEx, name: String? = null): RunnerAndConfigurationSettings
+
+    fun run(cargoProject: CargoProject, presentableName: String = command, saveConfiguration: Boolean = true) {
+        val project = cargoProject.project
+        val configurationName = when {
+            project.cargoProjects.allProjects.size > 1 -> "$presentableName [${cargoProject.presentableName}]"
+            else -> presentableName
+        }
+        val runManager = RunManagerEx.getInstanceEx(project)
+        val configuration = createRunConfiguration(runManager, configurationName).apply {
+            if (saveConfiguration) {
+                runManager.setTemporaryConfiguration(this)
+            }
+        }
+        val executor = DefaultRunExecutor.getRunExecutorInstance()
+        ProgramRunnerUtil.executeConfiguration(configuration, executor)
+    }
+}
+
+data class CargoCommandLine(
+    override val command: String, // Can't be `enum` because of custom subcommands
+    override val workingDirectory: Path, // Note that working directory selects Cargo project as well
+    override val additionalArguments: List<String> = emptyList(),
+    override val redirectInputFrom: File? = null,
+    val backtraceMode: BacktraceMode = BacktraceMode.DEFAULT,
+    val channel: RustChannel = RustChannel.DEFAULT,
+    val environmentVariables: EnvironmentVariablesData = EnvironmentVariablesData.DEFAULT,
+    val requiredFeatures: Boolean = true,
+    val allFeatures: Boolean = false,
+    val emulateTerminal: Boolean = false
+) : RsCommandLineBase() {
+
+    override fun createRunConfiguration(runManager: RunManagerEx, name: String?): RunnerAndConfigurationSettings =
+        runManager.createCargoCommandRunConfiguration(this, name)
+
+    /**
+     * Adds [arg] to [additionalArguments] as an positional argument, in other words, inserts [arg] right after
+     * `--` argument in [additionalArguments].
+     * */
+    fun withPositionalArgument(arg: String): CargoCommandLine {
+        val (pre, post) = splitOnDoubleDash()
+        if (arg in post) return this
+        return copy(additionalArguments = pre + "--" + arg + post)
+    }
+
+    /**
+     * Splits [additionalArguments] into parts before and after `--`.
+     * For `cargo run --release -- foo bar`, returns (["--release"], ["foo", "bar"])
+     */
+    fun splitOnDoubleDash(): Pair<List<String>, List<String>> =
+        org.rust.cargo.util.splitOnDoubleDash(additionalArguments)
+
+    fun prependArgument(arg: String): CargoCommandLine =
+        copy(additionalArguments = listOf(arg) + additionalArguments)
+
+    companion object {
+        fun forTargets(
+            targets: List<CargoWorkspace.Target>,
+            command: String,
+            additionalArguments: List<String> = emptyList(),
+            usePackageOption: Boolean = true
+        ): CargoCommandLine {
+            val pkgs = targets.map { it.pkg }
+            // Make sure the selection does not span more than one package.
+            assert(pkgs.map { it.rootDirectory }.distinct().size == 1)
+            val pkg = pkgs.first()
+
+            val targetArgs = targets.distinctBy { it.name }.flatMap { target ->
+                when (target.kind) {
+                    CargoWorkspace.TargetKind.Bin -> listOf("--bin", target.name)
+                    CargoWorkspace.TargetKind.Test -> listOf("--test", target.name)
+                    CargoWorkspace.TargetKind.ExampleBin, is CargoWorkspace.TargetKind.ExampleLib ->
+                        listOf("--example", target.name)
+                    CargoWorkspace.TargetKind.Bench -> listOf("--bench", target.name)
+                    is CargoWorkspace.TargetKind.Lib -> listOf("--lib")
+                    CargoWorkspace.TargetKind.CustomBuild,
+                    CargoWorkspace.TargetKind.Unknown -> emptyList()
+                }
+            }
+
+            val workingDirectory = if (usePackageOption) {
+                pkg.workspace.contentRoot
+            } else {
+                pkg.rootDirectory
+            }
+
+            val commandLineArguments = buildList<String> {
+                if (usePackageOption) {
+                    add("--package")
+                    add(pkg.name)
+                }
+                addAll(targetArgs)
+                addAll(additionalArguments)
+            }
+
+            return CargoCommandLine(command, workingDirectory, commandLineArguments)
+        }
+
+        fun forTarget(
+            target: CargoWorkspace.Target,
+            command: String,
+            additionalArguments: List<String> = emptyList(),
+            usePackageOption: Boolean = true
+        ): CargoCommandLine = forTargets(listOf(target), command, additionalArguments, usePackageOption)
+
+        fun forProject(
+            cargoProject: CargoProject,
+            command: String,
+            additionalArguments: List<String> = emptyList(),
+            channel: RustChannel = RustChannel.DEFAULT
+        ): CargoCommandLine = CargoCommandLine(
+            command,
+            workingDirectory = cargoProject.workingDirectory,
+            additionalArguments = additionalArguments,
+            channel = channel
+        )
+
+        fun forPackage(
+            cargoPackage: CargoWorkspace.Package,
+            command: String,
+            additionalArguments: List<String> = emptyList()
+        ): CargoCommandLine = CargoCommandLine(
+            command,
+            workingDirectory = cargoPackage.workspace.manifestPath.parent,
+            additionalArguments = listOf("--package", cargoPackage.name) + additionalArguments
+        )
+    }
+}
+
+data class WasmPackCommandLine(
+    override val command: String,
+    override val workingDirectory: Path,
+    override val additionalArguments: List<String> = emptyList()
+) : RsCommandLineBase() {
+    override val redirectInputFrom: File? = null
+
+    override fun createRunConfiguration(runManager: RunManagerEx, name: String?): RunnerAndConfigurationSettings {
+        val runnerAndConfigurationSettings = runManager.createConfiguration(
+            name ?: command,
+            WasmPackCommandConfigurationType.getInstance().factory
+        )
+        val configuration = runnerAndConfigurationSettings.configuration as WasmPackCommandConfiguration
+        configuration.setFromCmd(this)
+        return runnerAndConfigurationSettings
+    }
+}