The two line edit widgets above the spreadsheet, one for exiting the
cell contents and one for editing the alias, were set to use the same
editing widget as the individual spreadsheet cells. Once that widget was
refactored to handle tab/enter behavior it was no longer the correct
widget for those elements. This commit changes them to
Gui::ExpressionLineEdit widgets instead, so that the Enter key works
correctly for them again.
LineEdit no longer actually handles motion, it simply indicates which
action was taken to cause it to lose focus (e.g. which key was pressed).
It's up to the client code to determine what this means. This allows
significant consolidation of keyboard-handling logic, and the
implementation of more extensive keyboard navigation features.
New keyboard shortcuts include a tab counter to implement auto-return,
plus Ctrl->Arrow, End, Home, Ctrl-End, and Ctrl-Home, matching the
behavior of OpenOffice, LibreOffice, etc.
Block selection via keyboard has also been added by holding down the
shift key during navigation with the arrow keys (this also works in
combination with the Ctrl modifier for region navigation).
There are no reason to check the return values for these functions
as the string passed as an argument will be set to an empty string
if it false. An empty string is a valid option in these instances.
Coverity warnings fixed:
CID 316520 (1 of 1): Unchecked return value (CHECKED_RETURN)
3. check_return: Calling getAlias without checking return value (as is done elsewhere 8 out of 10 times).
CID 316557 (1 of 1): Unchecked return value (CHECKED_RETURN)
8. check_return: Calling getAlias without checking return value (as is done elsewhere 8 out of 10 times).
