[PATCH v2 5/5] Add a few more code comments and blank lines in guess_merge_tool

@@ -112,14 +112,17 @@ run_merge_tool () {
 }
 
 guess_merge_tool () {
+	# Add tools that can either do merging or diffing, but not both.
 	if merge_mode
 	then
 		tools="tortoisemerge"
 	else
 		tools="kompare"
 	fi
+
 	if test -n "$DISPLAY"
 	then
+		# Prefer GTK-based tools under Gnome.
 		if test -n "$GNOME_DESKTOP_SESSION_ID"
 		then
 			tools="meld opendiff kdiff3 tkdiff xxdiff $tools"

@@ -128,6 +131,8 @@ guess_merge_tool () {
 		fi
 		tools="$tools gvimdiff diffuse ecmerge p4merge araxis bc3"
 	fi
+
+	# Prefer vimdiff if vim is the default editor.
 	case "${VISUAL:-$EDITOR}" in
 	*vim*)
 		tools="$tools vimdiff emerge"

@@ -136,6 +141,7 @@ guess_merge_tool () {
 		tools="$tools emerge vimdiff"
 		;;
 	esac
+
 	echo >&2 "merge tool candidates: $tools"
 
 	# Loop over each candidate and stop when a valid merge tool is found.