[gnome-builder] emacs: add something similar to pop-global-mark

[Christian Hergert <chergert src gnome org>]

commit 9bd1e7557de5ca2d4297808f76dbf0116a801509
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 14 18:19:20 2018 +0100

    emacs: add something similar to pop-global-mark

 src/libide/keybindings/emacs.css | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libide/keybindings/emacs.css b/src/libide/keybindings/emacs.css
index 05353c142..b5c4f90dc 100644
--- a/src/libide/keybindings/emacs.css
+++ b/src/libide/keybindings/emacs.css
@@ -143,6 +143,7 @@
   bind "o" { "action" ("layoutgrid", "focus-neighbor", "0") };
   bind "grave" { "move-error" (down) };
   bind "h" { "select-all" (1) };
+  bind "<ctrl>space" { "action" ("history", "move-previous-edit", "") };
 }
 
 @binding-set builder-emacs-source-view-c