[dconf-editor] Make some methods static.

[Arnaud B. <arnaudb src gnome org>]

commit f5c22532317f452bd160fa80d7b893fc4d5344df
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Dec 16 16:52:09 2018 +0100

    Make some methods static.

 editor/base-window.vala    | 12 +++++++++---
 editor/browser-window.vala | 16 +++++++++-------
 2 files changed, 18 insertions(+), 10 deletions(-)
---
diff --git a/editor/base-window.vala b/editor/base-window.vala
index 2888049..73c3eb9 100644
--- a/editor/base-window.vala
+++ b/editor/base-window.vala
@@ -257,17 +257,23 @@ private class BaseWindow : AdaptativeWindow, AdaptativeWidget
 
     [GtkCallback]
     protected virtual bool on_key_press_event (Widget widget, Gdk.EventKey event)
+    {
+        return _on_key_press_event (widget, event);
+    }
+    private static bool _on_key_press_event (Widget widget, Gdk.EventKey event)
     {
         uint keyval = event.keyval;
         string name = (!) (Gdk.keyval_name (keyval) ?? "");
 
         if (name == "F1") // TODO fix dance done with the F1 & <Primary>F1 shortcuts that show help overlay
         {
-            headerbar.close_popovers ();
-            base_view.close_popovers ();
+            BaseWindow _this = (BaseWindow) widget;
+
+            _this.headerbar.close_popovers ();
+            _this.base_view.close_popovers ();
             if ((event.state & Gdk.ModifierType.SHIFT_MASK) == 0)
                 return false;   // help overlay
-            about ();
+            _this.about ();
             return true;
         }
 
diff --git a/editor/browser-window.vala b/editor/browser-window.vala
index 7129736..0df217b 100644
--- a/editor/browser-window.vala
+++ b/editor/browser-window.vala
@@ -650,25 +650,27 @@ private abstract class BrowserWindow : BaseWindow
                        "mouse-forward-button",    SettingsBindFlags.GET|SettingsBindFlags.NO_SENSITIVITY);
     }
 
-    private bool on_button_press_event (Widget widget, Gdk.EventButton event)
+    private static bool on_button_press_event (Widget widget, Gdk.EventButton event)
     {
-        if (!mouse_use_extra_buttons)
+        BrowserWindow _this = (BrowserWindow) widget;
+
+        if (!_this.mouse_use_extra_buttons)
             return false;
 
-        if (event.button == mouse_back_button)
+        if (event.button == _this.mouse_back_button)
         {
-            if (mouse_back_button == mouse_forward_button)
+            if (_this.mouse_back_button == _this.mouse_forward_button)
             {
                 warning (_("The same mouse button is set for going backward and forward. Doing nothing."));
                 return false;
             }
 
-            go_backward ((event.state & Gdk.ModifierType.SHIFT_MASK) != 0);
+            _this.go_backward ((event.state & Gdk.ModifierType.SHIFT_MASK) != 0);
             return true;
         }
-        if (event.button == mouse_forward_button)
+        if (event.button == _this.mouse_forward_button)
         {
-            go_forward ((event.state & Gdk.ModifierType.SHIFT_MASK) != 0);
+            _this.go_forward ((event.state & Gdk.ModifierType.SHIFT_MASK) != 0);
             return true;
         }
         return false;