Transactions filter fix.

alethzero/Main.ui

@@ -167,6 +167,7 @@
     <addaction name="paranoia"/>
     <addaction name="killBlockchain"/>
     <addaction name="inject"/>
+    <addaction name="clearPending"/>
    </widget>
    <addaction name="menu_File"/>
    <addaction name="menu_Network"/>
@@ -1444,6 +1445,11 @@ font-size: 14pt</string>
     <string>Shift+F10</string>
    </property>
   </action>
+  <action name="clearPending">
+   <property name="text">
+    <string>&amp;Clear Pending</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>

alethzero/MainWin.cpp

@@ -197,6 +197,11 @@ Main::~Main()
 	writeSettings();
 }
 
+void Main::on_clearPending_triggered()
+{
+	m_client->clearPending();
+}
+
 void Main::load(QString _s)
 {
 	QFile fin(_s);

alethzero/MainWin.h

@@ -114,6 +114,7 @@ private slots:
 	void on_showAllAccounts_triggered() { refresh(true); }
 	void on_loadJS_triggered();
 	void on_blockChainFilter_textChanged();
+	void on_clearPending_triggered();
 
 	void refresh(bool _override = false);
 	void refreshNetwork();

libethereum/Client.cpp

@@ -386,7 +386,7 @@ PastTransactions Client::transactions(TransactionFilter const& _f) const
 
 	auto cn = m_bc.number();
 	auto h = m_bc.numberHash(begin);
-	for (unsigned n = begin; ret.size() != m; n--, h = m_bc.details(h).parent)
+	for (unsigned n = begin; ret.size() != m && n != end; n--, h = m_bc.details(h).parent)
 	{
 		try
 		{

libethereum/Client.h

@@ -236,6 +236,9 @@ public:
 	/// Get and clear the mining history.
 	std::list<MineInfo> miningHistory() { auto ret = m_mineHistory; m_mineHistory.clear(); return ret; }
 
+	/// Clears pending transactions. Just for debug use.
+	void clearPending() { ClientGuard l(this); m_postMine = m_preMine; changed(); }
+
 private:
 	void work();