[[ Bug 12651 ]] back key can not work, and it crush
Merge remote-tracking branch 'sebastien/bugfix-12651' into refactor-syntax_unicode_6.7_merge
[[ MERG-6.7 ]] Fixes few memory leaks
Merge branch 'refactor-syntax_unicode_6.7_merge' of http://github.com/runrevsebastien/livecode into refactor-syntax_unicode_6.7_merge