[Tickets #12750] Keyboard scrolling in preview pane

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Ticket URL: http://bugs.horde.org/ticket/12750
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  Ticket             | 12750
  Created By         | horde at headbank.co.uk
  Summary            | Keyboard scrolling in preview pane
  Queue              | IMP
  Version            | 6.1.4
  Type               | Enhancement
  State              | New
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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horde at headbank.co.uk (2013-10-09 18:55) wrote:

At present there is no method of scrolling within Dynamic View preview  
pane, other than with the mouse (with soft scrollbar or mouse  
scroll-wheel).

The cursor keys have the effect of navigating the message-list; both  
planes (up/down vs left/right) have the same function, next/previous  
message.

There is no way (as far as I can tell; no accessibility documentation  
to be found) of scrolling the preview pane with the keyboard alone.  
This is a problem for keyboard-only users who receive mostly longish  
messages.

I see some immediate possibilities for addressing this:

1. Implement some method of toggling "focus" between message-list and  
preview panes;

2. Allocate one of the two cursor planes to scrolling the preview  
pane. My preference would be Up/Down, leaving Left/Right for  
navigating the message list. I guess which has the primary "right" to  
be represented by Up/Down is up for debate, and subject to use-case  
(i.e. whether user spends more time iterating between consecutive  
messages, or on scrolling through long messages - in my case it's  
definitely the latter).

3. Allocate a modifier+cursor shortcut (Ctrl+Up/Down seems to be free  
on IE9 and FF24) to one of the two functions. Same considerations as  
above as to which one needs the modifier key.

Apologies if I've overlooked anything - I did search extensively  
before asking.

Thanks,
Robin Bankhead