src: Introduce a <percent> named key

Similarly to the <semicolon> key, make it easier to write
`:execute-keys` commands by replacing <percent> with `%`.

Highlighters can keep escaping the sign when regular expressions are
not quoted, but built-in scripts that use `%` as an editing primitive
have been modified to use the named key, for clarity.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/keys.cc b/src/keys.cc
index 04932832..90cb0310 100644
--- a/src/keys.cc
+++ b/src/keys.cc
@@ -79,6 +79,7 @@ static constexpr KeyAndName keynamemap[] = {
     { "plus", '+' },
     { "minus", '-' },
     { "semicolon", ';' },
+    { "percent", '%' },
 };
 
 KeyList parse_keys(StringView str)