Keep view at the code when running .smartest.* files

Before this change, once you run the tests it will show "running X via Y
method". If you go to another Tmux window with your .smartest.* file, for
instance, once you return to Vim you're going to have to click yet another key.

Adding this code made the flow much snappier when the user is taken to
another terminal window. When they come back, they're right at the code
again.

plugin/smartest.vim

@@ -325,13 +325,27 @@ function! RunTests(filename)
 
       " Replaces $smartest_test_command in the file with whatever smartest figured out as
       " expected.
-      let final_test_command = substitute(test_command_from_file, "$smartest_test_command", smartest_test_command, "")
-      let final_test_command = substitute(final_test_command, "$filename", a:filename, "")
+      let final_test_command = substitute(test_command_from_file, "$smartest_test_command", smartest_test_command, "g")
+      let final_test_command = substitute(final_test_command, "$filename", a:filename, "g")
 
-      silent exec ":!echo " . smartest_test_description
+      " These lines were removed because when the user gets back to Vim, they
+      " would have to press a button to get back to code.
+      "
+      " Removing this code made the flow much snappier when the user is taken to
+      " another terminal window. When they come back, they're right at the code
+      " again.
+      "
+      " In case you want to see a message telling the user what's going on,
+      " uncomment these lines.
+      "
+      " silent exec ":!echo " . smartest_test_description
       " shellescape will write with quotes to stdout
-      silent exec ":!echo Running: " . shellescape(final_test_command, 1)
-      exec ":!" . final_test_command
+      " silent exec "!echo Running: " . shellescape(final_test_command, 1)
+      " exec ":!" . final_test_command
+      "
+
+      silent exec "!" . final_test_command
+      redraw!
     else
       echo "Don't know how to run tests. Define .smartest." . smartest_test_context
     endif