fix(intro): make intro explicitly stateful

Instead of randomly disappearing because some random event might have
caused mid_start or bot_scroll_start to randomly take a low value, treat
intro message as a _first class stateful_ thing.

This means that intro message will kept being _redrawn_ as long as we
are in the state it should be shown. This also includes screen resizes.
you will not lose the intro message because there was a delay in
detecting terminal features.

1 files changed, 6 insertions, 8 deletions

diff --git a/src/nvim/version.c b/src/nvim/version.c
index 038c9701bf..ff6f7835b2 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -2710,15 +2710,13 @@ void list_version(void)
                  : "\nRun \":verbose version\" for more info"));
 }
 
-/// Show the intro message when not editing a file.
-void maybe_intro_message(void)
+/// Whether it still is not too late to show an intro message
+bool may_show_intro(void)
 {
-  if (buf_is_empty(curbuf)
-      && (curbuf->b_fname == NULL)
-      && (firstwin->w_next == NULL)
-      && (vim_strchr(p_shm, SHM_INTRO) == NULL)) {
-    intro_message(false);
-  }
+  return (buf_is_empty(curbuf)
+          && (curbuf->b_fname == NULL)
+          && (firstwin->w_next == NULL)
+          && (vim_strchr(p_shm, SHM_INTRO) == NULL));
 }
 
 /// Give an introductory message about Vim.