Add a combo-box in place of the single line text field and
support some pre-defined date formats, such as:
MM/dd/yyyy
Each long format has a corresponding short variant stored in the
QMap dateFormatShortMap and it's updated automatically once
the user selects a combo box item for the long format.
The regex for dates is slighly modified:
[^dMy/\\s:;\\.,\\-]
The user is still allowed to enter custom long / short date foramats.
Fixes#276
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
2c06cb027f