*_tilde*: Escape tilde in [[ $1 == \~* ]] tests (RedHat: #817902).

bash_completion

@@ -920,7 +920,7 @@ _ncpus()
 _tilde()
 {
     local result=0
-    if [[ $1 == ~* && $1 != */* ]]; then
+    if [[ $1 == \~* && $1 != */* ]]; then
         # Try generate ~username completions
         COMPREPLY=( $( compgen -P '~' -u "${1#\~}" ) )
         result=${#COMPREPLY[@]}
@@ -956,7 +956,7 @@ _tilde()
 __expand_tilde_by_ref()
 {
     # Does $1 start with tilde (~)?
-    if [[ ${!1} == ~* ]]; then
+    if [[ ${!1} == \~* ]]; then
         # Does $1 contain slash (/)?
         if [[ ${!1} == */* ]]; then
             # Yes, $1 contains slash;