Fixes freeze when debugging failed to start: Dispatcher::post can now be performed within another Dispatcher::post, no longer leading to deadlock

src/dispatcher.cc

@@ -1,18 +1,27 @@
 #include "dispatcher.h"
+#include <vector>
 
 Dispatcher::Dispatcher() {
   connection=dispatcher.connect([this] {
+    std::vector<std::list<std::function<void()>>::iterator> its;
+    {
       std::unique_lock<std::mutex> lock(functions_mutex);
-    for(auto &function: functions)
-      function();
-    functions.clear();
+      its.reserve(functions.size());
+      for(auto it=functions.begin();it!=functions.end();++it)
+        its.emplace_back(it);
+    }
+    for(auto &it: its)
+      (*it)();
+    {
+      std::unique_lock<std::mutex> lock(functions_mutex);
+      for(auto &it: its)
+        functions.erase(it);
+    }
   });
 }
 
 Dispatcher::~Dispatcher() {
   disconnect();
-  std::unique_lock<std::mutex> lock(functions_mutex);
-  functions.clear();
 }
 
 void Dispatcher::disconnect() {