The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.
Hence, fixing them all now might curb this practice from now on.
Closes#12028
... simply because this is usually a sign of the user having omitted the
file name and the next option is instead "eaten" by the parser as a file
name.
Add test1268 to verify
Closes#2885
