Ensure tab toggle label is always correct (#1145)

* Make settings source of truth for indent-width etc

* Do not allow individual documents to change global settings
* Update document when settings change

* Code style

Author: Jeremy Wootten

src/Widgets/FormatBar.vala

@@ -173,23 +173,24 @@ public class Code.FormatBar : Gtk.Grid {
         tab_popover.add (tab_grid);
 
         tab_toggle.bind_property ("active", tab_popover, "visible", GLib.BindingFlags.BIDIRECTIONAL);
-        Scratch.settings.changed["indent-width"].connect (() => format_tab_header ());
-        Scratch.settings.changed["spaces-instead-of-tabs"].connect (() => format_tab_header ());
+        Scratch.settings.changed["indent-width"].connect (format_tab_header);
+        Scratch.settings.changed["spaces-instead-of-tabs"].connect (format_tab_header);
     }
 
     private void format_tab_header () {
         var indent_width = Scratch.settings.get_int ("indent-width");
         var spaces_instead_of_tabs = Scratch.settings.get_boolean ("spaces-instead-of-tabs");
-        if (doc != null) {
-            indent_width = (int)doc.source_view.tab_width;
-            spaces_instead_of_tabs = doc.source_view.insert_spaces_instead_of_tabs;
-        }
 
         if (spaces_instead_of_tabs) {
             tab_toggle.text = ngettext ("%d Space", "%d Spaces", indent_width).printf (indent_width);
         } else {
             tab_toggle.text = ngettext ("%d Tab", "%d Tabs", indent_width).printf (indent_width);
         }
+
+        if (doc != null) {
+            doc.source_view.tab_width = (uint)indent_width;
+            doc.source_view.insert_spaces_instead_of_tabs = spaces_instead_of_tabs;
+        }
     }
 
     private void format_line_header () {

src/Widgets/SourceView.vala

@@ -207,11 +207,6 @@ namespace Scratch.Widgets {
             return !start.equal (end);
         }
 
-        ~SourceView () {
-            // Update settings when an instance is deleted
-            update_settings ();
-        }
-
         public void change_syntax_highlight_from_file (File file) {
             try {
                 var info = file.query_info ("standard::*", FileQueryInfoFlags.NONE, null);
@@ -298,18 +293,6 @@ namespace Scratch.Widgets {
             style_changed (source_buffer.style_scheme);
         }
 
-        private void update_settings () {
-            var source_buffer = (Gtk.SourceBuffer) buffer;
-            Scratch.settings.set_boolean ("show-right-margin", show_right_margin);
-            Scratch.settings.set_int ("right-margin-position", (int) right_margin_position);
-            Scratch.settings.set_boolean ("highlight-matching-brackets", source_buffer.highlight_matching_brackets);
-            Scratch.settings.set_boolean ("spaces-instead-of-tabs", insert_spaces_instead_of_tabs);
-            Scratch.settings.set_int ("indent-width", (int) tab_width);
-            Scratch.settings.set_string ("font", font);
-            Scratch.settings.set_string ("style-scheme", source_buffer.style_scheme.id);
-            style_changed (source_buffer.style_scheme);
-        }
-
         public void go_to_line (int line, int offset = 0) {
             Gtk.TextIter it;
             buffer.get_iter_at_line (out it, line - 1);