g:jedi#quickfix_window_height

This commit adds an option g:jedi#quickfix_window_height, with the
    default value 10 (as this is the default value for :copen)

autoload/jedi.vim

@@ -104,7 +104,7 @@ endfunction
 function! jedi#add_goto_window()
     set lazyredraw
     cclose
-    execute 'belowright copen 3'
+    execute 'belowright copen '.g:jedi#quickfix_window_height
     set nolazyredraw
     if g:jedi#use_tabs_not_buffers == 1
         map <buffer> <CR> :call jedi#goto_window_on_enter()<CR>

plugin/jedi.vim

@@ -35,7 +35,8 @@ let s:settings = {
     \ 'show_function_definition': 1,
     \ 'function_definition_escape': "'≡'",
     \ 'auto_close_doc': 1,
-    \ 'popup_select_first': 1
+    \ 'popup_select_first': 1,
+    \ 'quickfix_window_height': 10
 \ }
 
 for [key, val] in items(s:settings)