Use dash.log to combine logs with dart (#8638)

Follow up to
flutter/dart-intellij-third-party#114

Author: helin24

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Changed
 
+- Made log file `dash.log` (instead of `flutter.log`).
+
 ### Removed
 
 ### Fixed

src/io/flutter/FlutterErrorReportSubmitter.java

@@ -21,6 +21,7 @@
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.util.Consumer;
+import io.flutter.logging.PluginLogger;
 import io.flutter.run.daemon.DaemonApi;
 import io.flutter.sdk.FlutterSdk;
 import org.jetbrains.annotations.NotNull;
@@ -181,7 +182,7 @@ public boolean submit(@NotNull IdeaLoggingEvent @NotNull [] events,
     builder.append("```\n");
     try {
       final String logPath = PathManager.getLogPath();
-      final File logFile = new File(logPath, "flutter.log");
+      final File logFile = new File(logPath, PluginLogger.LOG_FILE_NAME);
       if (logFile.exists()) {
         final List<String> lines = Files.readAllLines(logFile.toPath(), StandardCharsets.UTF_8);
         final int count = 200;

src/io/flutter/logging/PluginLogger.java

@@ -5,7 +5,6 @@
  */
 package io.flutter.logging;
 
-import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.application.PathManager;
 import com.intellij.openapi.diagnostic.LogLevel;
 import com.intellij.openapi.diagnostic.Logger;
@@ -18,7 +17,7 @@
 import java.util.logging.SimpleFormatter;
 
 public class PluginLogger {
-  private static final String LOG_FILE_NAME = "flutter.log";
+  public static final String LOG_FILE_NAME = "dash.log";
 
   // This handler specifies the logging format and location.
   private static final FileHandler fileHandler;