https://bugs.documentfoundation.org/show_bug.cgi?id=168147

            Bug ID: 168147
           Summary: Use of autofilter by keyboard results in a dead-end,
                    no further keyboard access, depends on mouse action
           Product: LibreOffice
           Version: 24.2.7.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

LibreOffice Calc 24.2.7.2

When you navigate an autofilter with the *keyboard*, you can lock yourself out
of Calc until you use a mouse to return focus back to the app's main pane.

This is a violation of accessibility, resulting in discrimination against those
who cannot use the mouse (e.g. shoulder impairments, elbow impairments,
inflamed tendons, repetitive strain injury, conditions that can become
litigation in the workplace etc) and those who are power users.

Steps to re-produce:
1. Set up test environment: remove the mouse from your desktop, or find a way
temporarily to disable your mouse on your laptop.

2. Open a sheet with an autofilter already on.

3. Use the keyboard to open the filter (ALT+DOWN), then SHIFT+TAB once to jump
to the top of the autofiler dropbox.
* observation: already, the keyboard is locked out for all other apps.  Even
ALT+TAB (it won't work on Linux Mint).

4. Type "fil".  Cursor should jump to "filter by colour".  Hit ESC.

5. DOWN to select "filter by condition".

6. RIGHT to select "empty", hit RETURN.

7. Calc returns to the main pane of the sheet.  Any cursor key should now move
the cell cursor.  Any other key should start typing in the currently selected
cell.  But nothing happens.  ALT+TAB still switches between apps (in Linux
Mint), and typing results in characters going to the other apps, but not to
Calc.  Calc is deaf.  Calc is no longer listening to the keyboard.

8. You have no choice but to use the mouse to click anywhere in Calc's main
pane.  You should now be able to type and, at last, Calc is now listening.

The fault is that there is an enforced dependancy on the mouse.  No mouse
action must ever be compulsory.  If you unplugged or disabled your mouse as per
step 1, you might need to find an alternative way of closing Calc or killing
the process to get keyboard control back of the Calc app.

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