A couple of quirks in the edit grid

Hi developers! Hi Dave!

Testing bet4, rev. 5567:5572 on Win XP
I found a couple of quirks in the edit grid.

- If I mark part of the text in a field and press <del> only first
character of the marked text gets deleted. One would expect all of the
marked text to be deleted. (That's what happens if I press the <back> key)

- Boolean field: Cycling through the values by hitting <space> starts
the cycles differently from clicking with the mouse.
The regular cycle is FALSE - TRUE - NULL. Mouse click follows that order
at all times. But <space> doesn't at the start, which is confusing.
If the field is TRUE, it goes to FALSE first, then starts the cycle.
If it is NULL, it goes to TRUE first, then starts the regular cycle.
If it is FALSE, it works as expected.

- Boolean field: If I edit a boolean field, then switch the focus to
another application and switch back, the field is still highlighted, the
value has changed back to text (from the little box icon) and keystrokes
are being ignored. <Esc> doesn not help. Nothing happens until I click
with the mouse. Does not happen with text or integer fields.

- If I mark a field (to copy the text) without changing anything, then
hit <Esc> to unselect again, the edit grid still (incorrectly) tells me,
that ..
"There is unsaved data in a row
Do you want to store to the database?"

- <tab> key jumps to next column in the edit grid. It stops at the last
column. Other spreadsheet-applications would keep going and jump to the
first column of the next row. (But maybe that is by design?)

Regards
Erwin