Suppress dots and header in stacktraces where possible

Requested by TelepathicGrunt (and frankly, why didn't I think of this earlier...)

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/world/ThreadDumper.java

@@ -5,16 +5,23 @@
 import java.lang.management.ThreadMXBean;
 
 public class ThreadDumper {
+    private static final String STACKTRACE_TAIL = "\t...\n\n";
     public static String obtainThreadDump() {
         ThreadMXBean threadmxbean = ManagementFactory.getThreadMXBean();
         ThreadInfo[] athreadinfo = threadmxbean.dumpAllThreads(true, true);
         StringBuilder sb = new StringBuilder();
         sb.append("Thread Dump:\n");
         for(ThreadInfo threadinfo : athreadinfo) {
-            sb.append(threadinfo);
+            String tInfo = threadinfo.toString();
             StackTraceElement[] elements = threadinfo.getStackTrace();
             if(elements.length > 8) {
-                sb.append("extended trace:\n");
+                if(tInfo.endsWith(STACKTRACE_TAIL))
+                    tInfo = tInfo.substring(0, tInfo.length() - STACKTRACE_TAIL.length());
+                else
+                    tInfo = tInfo + "extended trace:\n";
+            }
+            sb.append(tInfo);
+            if(elements.length > 8) {
                 for(int i = 8; i < elements.length; i++) {
                     sb.append("\tat ");
                     sb.append(elements[i]);