[libreoffice-accessibility] Guideline for navigation

Hi all,

we had a discussion in tdf#100898 how to make a11y consistent. Apparently the understanding of 
sidebars (and also decks/content panels) differs a little bit. Our guideline [1] says "Panes (aka 
decks) are switchable via tab buttons and via keyboard shortcut.", which is not sufficient.

From the MS guidelines [2]:

* The TAB key moves the input focus to the next area of an active pane only if it is not used by 
any other controls within the window.
* The CTRL+TAB shortcut keys or F6 function key moves the input focus to the next pane or palette.
* The CTRL+F6 combination moves the input focus to the next window in a group of related windows or 
between multiple-document interface (MDI) windows.

I would understand the content panel as kind of a tab control.

"...The Tab control can divide controls into several pages ...accessed by shortcut keys such as 
CTRL+TAB, CTRL+PAGE UP, and CTRL+ PAGE DOWN. Generally, the Tab control is within the navigation 
order of active UI elements. Users can navigate through different elements by using arrow keys when 
the input focus is on the control."

Solution 1 (that's my understanding of keyboard navigation yet it's not the current status):

+ Navigate on the top level UI hierarchy per F6. Start with the main menu, followed by the open 
toolbars, and finally the sidebar.
+ Use arrow keys to navigation within main menu and toolbars, and execute the function per Enter.
+ Within the sidebar use arrow keys to traverse the tabs (e.g. Properties, Styles, Gallery etc.). 
Press Return to enter the deck.
+ Within the deck cycle through the content panels (e.g. Styles, Character, Paragraph etc.) per 
ctrl+tab/shift+ctrl+tab.
+ Within the content panel navigate between controls using tab/shift+tab (e.g. Alignment, Bullets, 
Numbering etc. at Properties > Styles).
+ Use arrow keys to access controls that are part of a collection such as toggle buttons, lists, 
dropdowns (e.g. bold, italic, underline etc.).
+ Label all decks, content panels, controls/collections and provide mnemonic accelerator.
+ Go back to the document per Escape.

The least important function to close a content panel is reached per cursor right on the content 
panel title level. Ctrl+tab is the default to access panels in tab controls. 

Solution 2 (what we have today and what Stuart describes in comment 5 of tdf#100898):

+ Navigate on the top level UI hierarchy per F6. Start with the main menu, followed by open 
toolbars, and finally the sidebar.
+ In the sidebar cycle through deck title, content panels, and sidebar decks using the arrow keys.
+ Enter the sidebar deck per return, or cycle through the content including the close button per 
tab/shift+tab.
+ Use arrow keys to access controls that are part of a collection such as toggle buttons, lists, 
dropdowns etc.
+ Make the content panel title part of the tab sequence to allow exit.
+ Label all decks, content panels, controls/collections and provide mnemonic accelerator.
+ Go back to the document per Escape.

First of all, is this correct? And if yes, with what solution we should go ahead? At best we get 
input from Texou or someone else.

Cheers,
Heiko

[1] https://wiki.documentfoundation.org/Design/SideBar
[2] https://msdn.microsoft.com/en-us/library/ms971323.aspx


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