Hi,

The ergonomics of Calc could be made more efficient (need less click, movements from the user to do the same action).
When you want to apply an action to all columns, all rows, or all cells, you have to do the following :
click the X zone
X|B|C
-
1|
-
2|
then right click on columns headers for column actions,
right click on row "headers" for row actions, 
right click on cells for cells actions.
Then you must add the number of clicks for each action.

I'll take an example :
Suppose you want to unhide all hidden columns and all hidden rows.
You have to click 5 times
- X zone
- right click column, click unhide
- right click row, click unhide

I propose the X zone to be replaced by the following visual element,
split the X zone in 3 parts like this
  __
 | /|
 |/\|
and make all three zones clickable and right clickable:
- right part selects all columns and make it possible to apply actions (from contextual menu or other actions) to all columns
- lower part selects all rows and make it possible to apply actions (from contextual menu or other actions) to all rows
- upper left part selects all columns, rows, cell and make it possible to apply actions (from contextual menu or other actions) to all columns and/or all rows or all cells

I would like to name this element of ergonomics a triforce as a tribute to Zelda :D
(ok it doesn't exactly looks like a triforce but... Imagine saying to someone "click the triforce on your spreadsheet !"  It's much better than clicking "upperleft corner")
Hence, we could say right triforce, down triforce and triforce for right part, lower part, and upper left part respectively.

While the contextual menu when right clicking right triforce or down triforce is the same as right clicking columns or rows (after clicking X zone),
the contextual menu for the triforce is new.
It must be split in two parts :
- actions that can apply to both rows and columns
- actions that apply to cells

Back to the example, now you just need 2 clicks instead of 5 (right click triforce, click unhide)
The number of mouse movements required would similarly be decreased.

Note that there is no UI regression. Any user can still work the old way by left clicking the triforce then right clicking rows, columns or cells.

We can rename the triforce or ask Nintendo permission to use this name in official documentation, it would just be the cheery on the cake.
But what is truly important is the ergonomics.
I hope I clearly presented my idea.

Best regards,
   Laurent Lyaudet