[PATCH 2/2] mergetool: avoid letting `list_tool_variants` break user-defined setups

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From: Johannes Schindelin <johannes.schindelin@xxxxxx>

In 83bbf9b92ea8 (mergetool--lib: improve support for vimdiff-style tool
variants, 2020-07-29), we introduced a `list_tool_variants` function
in the spirit of Postel's Law: be lenient in what you accept as input.
In this particular instance, we wanted to allow not only `bc` but also
`bc3` as name for the Beyond Compare tool.

However, what this patch overlooked is that it is totally allowed for
users to override the defaults in `mergetools/`. But now that we strip
off trailing digits, the name that the user gave the tool might not
actually be in the list produced by `list_tool_variants`.

So let's do the same as for the `diff_cmd` and the `merge_cmd`: override
it with the trivial version in case a user-defined setup was detected.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 git-mergetool--lib.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 2defef28cd..7225abd811 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -138,6 +138,10 @@ setup_user_tool () {
 	merge_cmd () {
 		( eval $merge_tool_cmd )
 	}
+
+	list_tool_variants () {
+		echo "$tool"
+	}
 }
 
 setup_tool () {
-- 
gitgitgadget



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