[[ Bug 12828 ]] Ignore tab when calculating block width; draw RTL selection in correct place
Merge pull request #909 from runrevali/bugfix-12828

Bugfix 12828
[[ MERGE 6.7 ]] Add conversion from float to NumberRef
[[ MERGE 6.7 ]] endhostname is never null
[[ MERGE 6.7 ]] Retain pastebaord data to prevent overrelease
Fix memory leak in mutable DataRef
Fix data comparison issue
Merge branch 'refactor-syntax_unicode' into refactor-syntax_unicode_externals