[latexila] Fix warning with static not applicable to constants

[Sébastien Wilmet <swilmet src gnome org>]

commit 23d800240e5424b0ab1288fe228713ecfe4eecc1
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Oct 21 19:54:45 2016 +0200

    Fix warning with static not applicable to constants
    
    Vala now warns about this construct:
    warning: the modifier `static' is not applicable to constants
    
    And indeed it makes sense to use only const.

 src/document_structure.vala |    8 ++++----
 src/document_view.vala      |    8 ++++----
 src/most_used_symbols.vala  |    2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)
---
diff --git a/src/document_structure.vala b/src/document_structure.vala
index cf3d75b..679a09c 100644
--- a/src/document_structure.vala
+++ b/src/document_structure.vala
@@ -35,7 +35,7 @@ public class DocumentStructure : GLib.Object
 
     private unowned Document _doc;
     private int _nb_marks = 0;
-    private static const string MARK_NAME_PREFIX = "struct_item_";
+    private const string MARK_NAME_PREFIX = "struct_item_";
     private TextMark? _end_document_mark = null;
 
     private StructureModel _model = null;
@@ -50,11 +50,11 @@ public class DocumentStructure : GLib.Object
 
     // Only captions, TODOs and FIXMEs are truncated if needed, because the other
     // items are normally short enough.
-    private static const int ITEM_MAX_LENGTH = 60;
+    private const int ITEM_MAX_LENGTH = 60;
 
-    private static const int MAX_NB_LINES_TO_PARSE = 2000;
+    private const int MAX_NB_LINES_TO_PARSE = 2000;
     private int _start_parsing_line = 0;
-    private static const bool _measure_parsing_time = false;
+    private const bool _measure_parsing_time = false;
     private Timer _timer = null;
 
     private static string[] _section_names = null;
diff --git a/src/document_view.vala b/src/document_view.vala
index 7752704..d2ddbab 100644
--- a/src/document_view.vala
+++ b/src/document_view.vala
@@ -23,12 +23,12 @@ public class DocumentView : Gtk.SourceView
 {
     public const double SCROLL_MARGIN = 0.02;
 
-    private static const string METADATA_ATTRIBUTE_SPELL_LANGUAGE =
+    private const string METADATA_ATTRIBUTE_SPELL_LANGUAGE =
         "metadata::latexila-spell-language";
-    private static const string METADATA_ATTRIBUTE_INLINE_SPELL =
+    private const string METADATA_ATTRIBUTE_INLINE_SPELL =
         "metadata::latexila-inline-spell";
-    private static const string INLINE_SPELL_ENABLED_STR = "1";
-    private static const string INLINE_SPELL_DISABLED_STR = "0";
+    private const string INLINE_SPELL_ENABLED_STR = "1";
+    private const string INLINE_SPELL_DISABLED_STR = "0";
 
     private GLib.Settings _editor_settings;
     private Pango.FontDescription _font_desc;
diff --git a/src/most_used_symbols.vala b/src/most_used_symbols.vala
index 3dcceed..98dc079 100644
--- a/src/most_used_symbols.vala
+++ b/src/most_used_symbols.vala
@@ -28,7 +28,7 @@ public class MostUsedSymbols : GLib.Object
     private Gtk.ListStore _store;
 
     // The column containing the number of times a symbol has been used.
-    private static const int SYMBOL_COLUMN_NUM = SymbolColumn.N_COLUMNS;
+    private const int SYMBOL_COLUMN_NUM = SymbolColumn.N_COLUMNS;
 
     private MostUsedSymbols ()
     {