Fix that changing the selection by keyboard input before coding has no effect

[tanius]

(This is probably something that has to be reported upstream in Annotator and fixed there. Also, it's not a big issue at all. Still reporting it here so we can deal with it orderly …)

Given the following steps:

1. Select some text in the Open Ethnographer coding interface using the pointing device.

2. Press Shift + ← resp. Shift + → to change the selection with keyboard input.

3. Press the Annotator overlay button and assign a code to the selected text.

then the code is assigned to the portion selected in step 1 while it should be assigned to the portion in step 2.

Note that this is not a general issue with changing the selection after the Annotator overlay button was displayed. When changing the selected text afterwards using Shift + Click, that change is picked up.

(Environment: Chromium 75.0 on Ubuntu Linux 18.10.)

[tanius]

Implementation should wait until we have switched out Annotator.JS for a still-maintained alternative. The issue may resolve itself with that change.