Backwards selection copies everything till the end of transcript

[ShinNoNoir]

When you select text backwards in the demo, instead of the selected words being copied, everything from the latest (transcription-wise) word to the last word is copied.

Steps to reproduce:

• Load "Internet Amazonians" in the demo.
• Select "using unconventional" in the first paragraph, starting at the "l" of "unconventional".

Expected output:

• "using unconventional" being copied to the right pane.

Actual output:

• Everything from "unconventional" till the end is copied, i.e. "unconventional methods [...] and for a better climate on Earth."