refactor(misc1): move insertmode related function to edit.c

src/nvim/edit.c

@@ -832,6 +832,16 @@ static int insert_execute(VimState *state, int key)
   return insert_handle_key(s);
 }
 
+
+/// Return true when need to go to Insert mode because of 'insertmode'.
+///
+/// Don't do this when still processing a command or a mapping.
+/// Don't do this when inside a ":normal" command.
+bool goto_im(void)
+{
+  return p_im && stuff_empty() && typebuf_typed();
+}
+
 static int insert_handle_key(InsertState *s)
 {
   // The big switch to handle a character in insert mode.

src/nvim/misc1.c

@@ -437,13 +437,3 @@ done:
   xfree(tempname);
   return buffer;
 }
-
-/*
- * Return TRUE when need to go to Insert mode because of 'insertmode'.
- * Don't do this when still processing a command or a mapping.
- * Don't do this when inside a ":normal" command.
- */
-int goto_im(void)
-{
-  return p_im && stuff_empty() && typebuf_typed();
-}