Fix timestamp normalization for old backend

src/control/xojfile/LoadHandler.cpp

@@ -554,10 +554,22 @@ void LoadHandler::parseStroke()
 		stroke->setAudioFilename(fn);
 	}
 
-	int ts = 0;
-	if (LoadHandlerHelper::getAttribInt("ts", true, this, ts))
+
+	if (this->fileversion < 4)
+	{
+		int ts = 0;
+		if (LoadHandlerHelper::getAttribInt("ts", true, this, ts))
+		{
+			stroke->setTimestamp(ts * 1000);
+		}
+	}
+	else
 	{
-		stroke->setTimestamp(ts);
+		size_t ts = 0;
+		if (LoadHandlerHelper::getAttribSizeT("ts", true, this, ts))
+		{
+			stroke->setTimestamp(ts);
+		}
 	}
 
 	int fill = -1;

src/control/xojfile/LoadHandlerHelper.cpp

@@ -187,3 +187,48 @@ bool LoadHandlerHelper::getAttribInt(const char* name, bool optional, LoadHandle
 
 	return true;
 }
+
+size_t LoadHandlerHelper::getAttribSizeT(const char* name, LoadHandler* loadHandler)
+{
+	const char* attrib = getAttrib(name, false, loadHandler);
+
+	if (attrib == NULL)
+	{
+		error("%s", FC(_F("Attribute \"{1}\" could not be parsed as size_t, the value is NULL") % name));
+		return 0;
+	}
+
+	char* ptr = NULL;
+	size_t val = g_ascii_strtoull(attrib, &ptr, 10);
+	if (ptr == attrib)
+	{
+		error("%s", FC(_F("Attribute \"{1}\" could not be parsed as size_t, the value is \"{2}\"") % name % attrib));
+	}
+
+	return val;
+}
+
+bool LoadHandlerHelper::getAttribSizeT(const char* name, bool optional, LoadHandler* loadHandler, size_t& rValue)
+{
+	const char* attrib = getAttrib(name, optional, loadHandler);
+
+	if (attrib == NULL)
+	{
+		if (!optional)
+		{
+			g_warning("Parser: attribute %s not found!", name);
+		}
+		return false;
+	}
+
+	char* ptr = NULL;
+	size_t val = strtoull(attrib, &ptr, 10);
+	if (ptr == attrib)
+	{
+		error("%s", FC(_F("Attribute \"{1}\" could not be parsed as size_t, the value is \"{2}\"") % name % attrib));
+	}
+
+	rValue = val;
+
+	return true;
+}

src/control/xojfile/LoadHandlerHelper.h

@@ -29,4 +29,6 @@ public:
 	static double getAttribDouble(const char* name, LoadHandler* loadHandler);
 	static int getAttribInt(const char* name, LoadHandler* loadHandler);
 	static bool getAttribInt(const char* name, bool optional, LoadHandler* loadHandler, int& rValue);
+	static size_t getAttribSizeT(const char* name, LoadHandler* loadHandler);
+	static bool getAttribSizeT(const char* name, bool optional, LoadHandler* loadHandler, size_t& rValue);
 };

src/control/xojfile/SaveHandler.cpp

@@ -93,7 +93,7 @@ void SaveHandler::prepareSave(Document* doc)
 void SaveHandler::writeHeader()
 {
 	this->root->setAttrib("creator", PROJECT_STRING);
-	this->root->setAttrib("fileversion", "3");
+	this->root->setAttrib("fileversion", "4");
 	this->root->addChild(new XmlTextNode("title", "Xournal++ document - see " PROJECT_URL));
 }