Append space on C-SPC if not at end-of-symbol

Completion rarely works in the middle of (or at the beginning of) a
symbol, so we insert a space in front of the cursor in those cases and
then invoke completion.

modules/completion/company/autoload.el

@@ -103,6 +103,9 @@ To have BACKENDS apply to any mode that is a parent of MODES, set MODES to
   "Bring up the completion popup. If only one result, complete it."
   (interactive)
   (require 'company)
+  (when (/= (point)
+            (cdr (bounds-of-thing-at-point 'symbol)))
+    (save-excursion (insert " ")))
   (when (and (company-manual-begin)
              (= company-candidates-length 1))
     (company-complete-common)))