We currently flood the log with `Text input commit received without focus`

We have about 30 of these per second:

2019-04-15 11:46:37 - [subprojects/wlroots/types/wlr_text_input_v3.c:179] Text input commit received without focus
2019-04-15 11:46:37 - [src/text_input.c:140] Inactive text input tried to commit an update

so s.th. is wrong in that area.

Feature: #10 (closed) (-Dorota)