patch 9.0.0622: matchaddpos() can get slow when adding many matches
Problem: matchaddpos() can get slow when adding many matches.
Solution: Update the next available match ID when manually picking an ID and
remove check if the available ID can be used. (idea by Rick Howe)
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 81758af..e5740a5 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -5864,7 +5864,7 @@
respectively. 3 is reserved for use by the |matchparen|
plugin.
If the {id} argument is not specified or -1, |matchadd()|
- automatically chooses a free ID.
+ automatically chooses a free ID, which is at least 1000.
The optional {dict} argument allows for further custom
values. Currently this is used to specify a match specific