patch 9.0.0634: evaluating "expr" options has more overhead than neededv9.0.0634

Problem:    Evaluating "expr" options has more overhead than needed.
Solution:   Use call_simple_func() for 'foldtext', 'includeexpr', 'printexpr',
            "expr" of 'spellsuggest', 'diffexpr', 'patchexpr', 'balloonexpr',
            'formatexpr', 'indentexpr' and 'charconvert'.

1 files changed, 6 insertions, 0 deletions

diff --git a/runtime/doc/diff.txt b/runtime/doc/diff.txt
index a66df1e273..e5321c586d 100644
--- a/runtime/doc/diff.txt
+++ b/runtime/doc/diff.txt
@@ -376,6 +376,9 @@ Additionally, 'diffexpr' should take care of "icase" and "iwhite" in the
 'diffopt' option.  'diffexpr' cannot change the value of 'lines' and
 'columns'.
 
+The advantage of using a function call without arguments is that it is faster,
+see |expr-option-function|.
+
 Example (this does almost the same as 'diffexpr' being empty): >
 
 	set diffexpr=MyDiff()
@@ -441,6 +444,9 @@ will have the same effect.  These variables are set to the file names used:
 	v:fname_diff		patch file
 	v:fname_out		resulting patched file
 
+The advantage of using a function call without arguments is that it is faster,
+see |expr-option-function|.
+
 Example (this does the same as 'patchexpr' being empty): >
 
 	set patchexpr=MyPatch()