Some tweaks

behavior.el

@@ -86,3 +86,18 @@
   (setq next-screen-context-lines
         (max 1 (/ (1- (window-height (selected-window))) 2)))
   ad-do-it)
+
+
+;; Make Project Explorer open selected file in last used buffer
+(setq pe/display-content-buffer-function
+      (lambda (buffer)
+        (let* (( last-buffer
+                 (car (cl-remove 'project-explorer-mode
+                                 (buffer-list)
+                                 :key (apply-partially 'buffer-local-value
+                                                       'major-mode))))
+               ( window (get-buffer-window last-buffer)))
+          (if window
+              (set-window-buffer window buffer)
+            (pe/show-buffer buffer)))
+        ))

custom-variables.el

@@ -55,6 +55,7 @@
  '(feature-indent-initial-offset 0)
  '(fill-column 78)
  '(flycheck-completion-system (quote ido))
+ '(flycheck-idle-change-delay 1.0)
  '(flycheck-indication-mode (quote right-fringe))
  '(global-auto-revert-mode t)
  '(global-undo-tree-mode t)

keybindings.el

@@ -48,7 +48,6 @@
 
 ;; align-regexp
 (global-set-key (kbd "C-c C-a") 'align-regexp)
-;; (global-set-key (kbd "C-c \\") 'align-regexp) ;; keep till I get used to C-c C-a
 
 ;; Toggle auto-fill-mode.
 (global-set-key (kbd "C-c q") 'auto-fill-mode)