fix(scp): fix a bug that -F<prefix>[TAB] did not complete at all (#1396)

This was because the filtering by a modified `cur` is performed after
prefixing "-F".  Since we generate the filenames starting with "$cur",
we do not need to further filter the results with `cur`.  We disable
the filtering by specifying the `-R` flag to `_comp_compgen`.

Author: akinomyoga

completions/ssh

@@ -547,13 +547,13 @@ _comp_xfunc_scp_compgen_local_files()
     local files
     _comp_expand_glob files '"$cur"*' || return 0
     if [[ $_dirsonly ]]; then
-        _comp_compgen -U files split -l -- "$(
+        _comp_compgen -RU files split -l -- "$(
             command ls -aF1dL "${files[@]}" 2>/dev/null |
                 command sed -e "s/$_comp_cmd_scp__path_esc/\\\\&/g" \
                     -e '/[^\/]$/d' -e "s/^/${1-}/"
         )"
     else
-        _comp_compgen -U files split -l -- "$(
+        _comp_compgen -RU files split -l -- "$(
             command ls -aF1dL "${files[@]}" 2>/dev/null |
                 command sed -e "s/$_comp_cmd_scp__path_esc/\\\\&/g" \
                     -e 's/[*@|=]$//g' -e 's/[^\/]$/& /g' -e "s/^/${1-}/"

test/t/test_scp.py

@@ -58,6 +58,14 @@ def test_capital_f_without_space(self, completion):
             "option requires an argument -- F" in x for x in completion
         )
 
+    @pytest.mark.complete("scp -Fconf", cwd="scp")
+    def test_capital_f_without_space_2(self, completion):
+        assert completion == "ig"
+
+    @pytest.mark.complete("scp -Fbi", cwd="scp")
+    def test_capital_f_without_space_3(self, completion):
+        assert completion == "n/"
+
     @pytest.fixture(scope="class")
     def live_pwd(self, bash):
         try: