Fix match result select trailing emphatic characters (っッー)

[khaitruong922]

#980

Currently due to the collapseEmphaticSequences preprocessor, terms with trailing emphatic characters will match the main term, which will result in the selection highlighting the trailing emphatic part. This fix will make sure the algorithm leave at least 1 trailing emphatic characters if there is any, to avoid matching the main term.

For example: 学生っ will not match 学生

[StefanVukovic99]

I don't really get how the collapseEmphaticSequences function works, but LGTM

[khaitruong922]

I don't really get how the collapseEmphaticSequences function works, but LGTM

It will try to match word without those emphatics.
For example: かっっこいい will match かっこいい, すーごーーーい will match すごい