https://bugzilla.redhat.com/show_bug.cgi?id=1411688
--- Comment #3 from Mike FABIAN <mfabian(a)redhat.com> ---
The screenshots
ibus-typing-booster-backspace-and-delete-problem-first.png and
ibus-typing-booster-backspace-and-delete-problem-second.png
demonstrate the problem.
The user has typed “I can not ” and then recognizes that “cannot”
should be spelled as one word and wants to fix that. So the user moves
the cursor back with the arrow left key. As soon as the cursor is
behind the “t” of the word “not”, the preëdit is reopened and “not” is
placed into the preëdit. One can see that because “not” is then
underlined. Now the cursor is moved further left with the arrow left
key until the cursor is left of the “n”. Typing Backspace now trying
to delete the space between “can” and “not” achieves nothing,
Backspace just does nothing at the end of the preëdit currently. So
one can try to use the arrow left key one more time to get out of the
preëdit. But when doing that, the preëdit is committed and the cursor
is moved left (which is intuitive and logical). That makes the cursor
end up behind the “n” of the word “can” and reopens the preëdit again,
putting “can” into the preëdit. ”can” is now underlined. Again one
cannot remove the space between “can” and “not” by typing Delete
because Delete currently does nothing at the end of the preëdit.
That behaviour makes it quite hard to delete spaces between words. As
a workaround, one can do that by positioning the cursor using the
mouse, not with the arrow keys and then use Backspace or Delete.
Or, switch off ibus-typing-booster temporarily, delete the space
and switch ibus-typing-booster on again. This is annoying.
So the behaviour of Backspace and Delete should be improved at the
ends of the preëdit. When at the left side of a preëdit, Backspace
should commit and send a Backspace to the application. I.e. when the
cursor is left of the “not” in “can not”, the “not” should be
committed and a Backspace should be sent to the application which
deletes the space, giving us “cannot”.
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