Try to fix Windows Uri issue

src/pdf/popplerapi/PopplerGlibDocument.cpp

@@ -58,6 +58,20 @@ bool PopplerGlibDocument::equals(XojPdfDocumentInterface* doc)
 	return document == ((PopplerGlibDocument*)doc)->document;
 }
 
+string pathToUri(path filename, GError** error)
+{
+	char * uri = g_filename_to_uri(filename.c_str(), NULL, error);
+
+	if (uri == NULL)
+	{
+		return "";
+	}
+
+	string uriString = uri;
+	g_free(uri);
+	return uriString;
+}
+
 bool PopplerGlibDocument::save(path filename, GError** error)
 {
 	XOJ_CHECK_TYPE(PopplerGlibDocument);
@@ -67,15 +81,11 @@ bool PopplerGlibDocument::save(path filename, GError** error)
 		return false;
 	}
 
-	string uri = "file://";
-	uri += filename.string();
-
-#if WIN32
-	StringUtils::replace_all_chars(uri, {
-		replace_pair('\\', "/"),
-	});
-#endif
-
+	string uri = pathToUri(filename, error);
+	if (*error != NULL)
+	{
+		return false;
+	}
 	return poppler_document_save(document, uri.c_str(), error);
 }
 
@@ -83,17 +93,13 @@ bool PopplerGlibDocument::load(path filename, string password, GError** error)
 {
 	XOJ_CHECK_TYPE(PopplerGlibDocument);
 
-	string uri = "file://";
-	uri += filename.string();
-
-#if WIN32
-	StringUtils::replace_all_chars(uri, {
-		replace_pair('\\', "/"),
-	});
-#endif
+	string uri = pathToUri(filename, error);
+	if (*error != NULL)
+	{
+		return false;
+	}
 
 	this->document = poppler_document_new_from_file(uri.c_str(), password.c_str(), error);
-
 	return this->document != NULL;
 }