Ex mode: use getexline() instead of getexmodeline()

This changes Ex mode (Q, -e) to work like Vim's "improved Ex mode"
(gQ, -E).  That brings some small behavior differences, but should not
impact most Ex scripts (unless, for example, they depend on mappings
being disabled--but that can be solved for -e by skipping user config).

Before this change:
* the screen test hangs.

After this change:
* Q acts like gQ.
* -e/-es differs from -E/-Es only in its treatment of stdin.

This moves towards potentially removing getexmodeline().
(HINT: That does NOT mean "removing Ex mode", it means removing the
Vi-compatible Ex mode, which differs from Vim's "improved Ex mode" only
in some minor details (e.g. mappings are disabled).)

ref #1089 :-)~

1 files changed, 11 insertions, 1 deletions

diff --git a/test/functional/core/startup_spec.lua b/test/functional/core/startup_spec.lua
index f323056179..c20ac668c4 100644
--- a/test/functional/core/startup_spec.lua
+++ b/test/functional/core/startup_spec.lua
@@ -123,9 +123,19 @@ describe('startup', function()
   end)
 
   it('-e/-E interactive #7679', function()
-    clear('-E')
+    clear('-e')
     local screen = Screen.new(25, 3)
     screen:attach()
+    feed("put ='from -e'<CR>")
+    screen:expect([[
+      :put ='from -e'          |
+      from -e                  |
+      :^                        |
+    ]])
+
+    clear('-E')
+    screen = Screen.new(25, 3)
+    screen:attach()
     feed("put ='from -E'<CR>")
     screen:expect([[
       :put ='from -E'          |