<t/> alignment in lsx-comp

[mr-martian]

Due to the way <t/> is handled,
<p><l>a<t/></l><r>b<t/></r></p> will match arbitrary tags
but <p><l>a<t/></l><r>bc<t/></r></p> will not because the two <t/>s are not perfectly aligned. It should be possible to automatically align them.