fix(linux): Fix reordering of output

This change implements a commit queue which allows to control the
order of the output. This ensures that any backspace we generate
will be processed before the character we're adding.

Requires changes in ibus (surrounding text fix (see #7072) and
prefilter change)

Fixes #1489, #4028, #4029, #4030, #4505, #5510, #6639