[Bug 167484] When no text is selected, font controls should reflect the chosen keyboard layout

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=167484

--- Comment #7 from V Stuart Foote <vsfoote at libreoffice.org> ---
(In reply to Eyal Rozenberg from comment #6)

> > And probably don't want a language change on active keyboard to assert
> > against entire paragraphs, as that would make it impossible to work polyglot
> > for a single paragraph.
> 
> assert... ?
> 
> Can you describe the scenarios which you find problematic with my suggestion?
> 
> More specifically - suppose I have a sequence of characters which are
> strongly RTL-CTL. Now, in the middle of that sequence, I change the keyboard
> layout to French. My ask here is to have the formatting toolbar show me the
> French typeface, font size, etc. Do you think this is problematic?

*in the middle of that sequence*

Issue would be with how it would be laid down in the text run. With DF or Text
style applied to the text entered mid span, you'd end up with a text run of
mixed style assignments in the ODF, potentially misidentified language, with
RSID tags to boot. 

To keep the chaos down (and keep the ODF/OOXML meaningful), it would be
reasonable to limit the keyboard/IME has changed response to apply at ICU lib
word bounds for current edit cursor, or to word/sentence ends when a bounding
selection of words has been  made.

Hard to justify the mess that would result doing it mid-word.

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