tests: Load screendump files with "git vimdumps"
Also, fold the difference part and the bottom part for the
identical screendump files.
closes: #16380
Co-authored-by: D. Ben Knoble <ben.knoble+github@gmail.com>
Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/testdir/README.txt b/runtime/syntax/testdir/README.txt
index b96e8f6..6703228 100644
--- a/runtime/syntax/testdir/README.txt
+++ b/runtime/syntax/testdir/README.txt
@@ -199,6 +199,9 @@
Viewing generated screendumps (submitted for a pull request)
------------------------------------------------------------
+Note: There is also a "git difftool" extension described in
+ src/testdir/commondumps.vim
+
First, you need to check out the topic branch with the proposed changes and
write down a difference list between the HEAD commit (index) and its parent
commit with respect to the changed "dumps" filenames: