logic: fixes all over the place

* fixed refreshing to send another ui refresh message after parsing
* keepContent field for MessageBase so that views won't update
* fixed searchmatching to only weigh uppercase letters next to lowercase ones
* fixed file not jumping back to snippets when activating edge
* clicking into empty space deselects active edge
* clear file manager files on every fetch
* added db transaction for file clearing
* use zooming instead of changing font size

src/lib/utility/messaging/MessageBase.h

@@ -17,6 +17,7 @@ public:
 	MessageBase()
 		: undoRedoType(UNDOTYPE_NORMAL)
 		, m_sendAsTask(true)
+		, m_keepContent(false)
 	{
 	}
 
@@ -47,10 +48,21 @@ public:
 		return (undoRedoType == UNDOTYPE_IGNORE);
 	}
 
+	void setKeepContent(bool keepContent)
+	{
+		m_keepContent = keepContent;
+	}
+
+	bool keepContent() const
+	{
+		return m_keepContent;
+	}
+
 	UndoType undoRedoType;
 
 private:
 	bool m_sendAsTask;
+	bool m_keepContent;
 };
 
 #endif // MESSAGE_BASE_H

src/lib/utility/messaging/type/MessageActivateEdge.h

@@ -17,6 +17,7 @@ public:
 		, fromNameHierarchy(fromName)
 		, toNameHierarchy(toName)
 	{
+		setKeepContent(true);
 	}
 
 	static const std::string getStaticType()

src/lib/utility/messaging/type/MessageDeactivateEdge.h

@@ -0,0 +1,20 @@
+#ifndef MESSAGE_DEACTIVATE_EDGE_H
+#define MESSAGE_DEACTIVATE_EDGE_H
+
+#include "utility/messaging/Message.h"
+
+class MessageDeactivateEdge
+	: public Message<MessageDeactivateEdge>
+{
+public:
+	MessageDeactivateEdge()
+	{
+	}
+
+	static const std::string getStaticType()
+	{
+		return "MessageDeactivateEdge";
+	}
+};
+
+#endif // MESSAGE_DEACTIVATE_EDGE_H