### Link to issue number:

Partially implements feature requests from nvaccess#6915

 ### Summary of the issue:

Commit 20bdb39
("soffice: Report keyboard-triggered font size change (nvaccess#17147)")
implemented announcement of the new value of the font size combobox
in Writer's formatting toolbar when it is changed via keyboard shortcut.
Issue nvaccess#6915 requests announcement of further attributes, including
the announcement of the current paragraph style when applying
"Heading 1",..., "Heading 5" styles via the Ctrl+1,..., Ctrl+5 keyboard
shortcuts.

 ### Description of user facing changes

When applying the "Body Text" or a heading paragraph
style using the corresponding keyboard shortcut in
LibreOffice Writer 25.2 or newer, NVDA announces the
new paragraph style.

 ### Description of development approach

Extend the solution from the above-mentioned
commit 20bdb39.
Other than the simpler case of the font size combo box,
changing the paragraph style can imply more related
formatting changes (e.g. font size, bold,...).
To avoid triggering the announcement of these implicit
formatting changes, but rather announce the new paragraph
style to confirm that the user-triggered action had the
expected result, introduce a way to reliably identify the
paragraph style combobox in the formatting toolbar:

1) Add an "id" object attribute to the IAccessible2 object attribute
specification:

> This identifier remains the same across different sessions of
> the same application, regardless of the UI language.

IAccessible2 commit: LinuxA11y/IAccessible2@2b8c2c7

2) In LibreOffice, set the "id" attribute to the ID
already used in the UI file format (GtkBuilder XML files):
https://git.libreoffice.org/core/commit/21b29f25660db973fa1480de77e6a69d76a5de53

3) In NVDA, extend the logic for announcing gesture-triggered
formatting changes to allow specifying a specific ID of the
UI element(s) of interest. If one is set, don't announce
changes in other UI elements for that gesture.
Set the ID to the one that the paragraph style combobox in
Writer's formatting toolbar has ("applystyle").
Let NVDA handle the Ctrl+0, Ctrl+1, Ctrl+2, Ctrl+3, Ctrl+4 and Ctrl+5
gestures to announce the new paragraph style ("Body Text" for Ctrl+0,
corresponding heading for Ctrl+1 through Ctrl+5).

 ### Testing strategy:

1. start NVDA
2. start current development version of LibreOffice Writer (with English UI and keyboard layout)
3. Press Ctrl+1 to apply paragraph Style "Heading 1"
4. Verify that NVDA announces the new paragraph style by name, i.e. says "Heading 1"
5. Repeat steps 3 and 4 with Ctrl+2, Ctrl+3, Ctrl+4, Ctrl+5 to verify
   that the other heading levels are also announced correctly.
6. Press Ctrl+0 to apply paragraph style "Body Text" and verify
   that NVDA announces the new paragraph style by name, i.e. says "Body Text"
8. Retest that the other supported keyboard gestures as implemented in
   commits 46a3436 and
   20bdb39 are still announced as
   expected.

 ### Known issues with pull request:

None, but note that a current LibreOffice development version
(to become LibreOffice 25.2) is required for the feature to actually work.

 ### Code Review Checklist:

- [x] Documentation:
  - Change log entry
  - User Documentation
  - Developer / Technical Documentation
  - Context sensitive help for GUI changes
- [x] Testing:
  - Unit tests
  - System (end to end) tests
  - Manual testing
- [x] UX of all users considered:
  - Speech
  - Braille
  - Low Vision
  - Different web browsers
  - Localization in other languages / culture than English
- [x] API is compatible with existing add-ons.
- [x] Security precautions taken.

Co-authored-by: Sascha Cowley <16543535+SaschaCowley@users.noreply.github.com>