Prevent insertion of popup text into buffer, fix #325

Fix a test case

Apply minor modernizations (abort, reltimefloat)

Fix a missed TS support check

Add tex matchpref for relaxed env match (re #131)

Merge pull request #94 from cocopon/fix-indent-with-tab

Fix tab indent for popup

Add vimOperParen to skip (closes #54)

Add background highlight to documentation

Fix typo in doc

Remove small bit of dead code