Disable the elements list when no document is open. Closes #194.

Author: trypsynth

src/main_window.cpp

@@ -342,7 +342,6 @@ void main_window::update_ui() {
 		ID_GO_TO_PERCENT,
 		ID_GO_BACK,
 		ID_GO_FORWARD,
-		ID_GO_TO_PAGE,
 		ID_PREVIOUS_SECTION,
 		ID_NEXT_SECTION,
 		ID_PREVIOUS_HEADING,
@@ -359,6 +358,7 @@ void main_window::update_ui() {
 		ID_NEXT_HEADING_5,
 		ID_PREVIOUS_HEADING_6,
 		ID_NEXT_HEADING_6,
+		ID_GO_TO_PAGE,
 		ID_PREVIOUS_PAGE,
 		ID_NEXT_PAGE,
 		ID_PREVIOUS_BOOKMARK,
@@ -375,6 +375,7 @@ void main_window::update_ui() {
 		ID_WORD_COUNT,
 		ID_DOC_INFO,
 		ID_TABLE_OF_CONTENTS,
+		ID_LIST_ELEMENTS,
 		ID_OPEN_CONTAINING_FOLDER,
 		ID_IMPORT,
 		ID_EXPORT_DOCUMENT_DATA,