"Amount too high" warning can result in negative items

[ibboard]

The checks to use the max/min limit if the amount is outside the range can create invalid values in certain situations. The Ork Boyz attached to #209 show the behaviour most.

If a unit of 30 is made with a selection of 2 of one weapon and 1 of another, then the unit is dropped to 10-19 models (only allowed one weapon) editing the "1" selection will suggest an amount of -1 (current limit - amount taken not including item = 1 - 2 = -1). This should show "0" and make the user remove the item instead of showing a negative. The fact that the user is still over the limit would then be picked up by validation checks, once implemented.

[ibboard]

(In r403) Fixes #218: "Amount too high" warning can result in negative items

• Restrict min/max values to a minimum of "0" to stop negatives
• Ignore all events from widgets in EquimentAmountControl until we've finished setting it up for the new equipment item
• Fire value modified events if the value has been limited
• Remove disabling of OK button so that "Edit" dialog enables OK if amount has been limited

[ibboard]

Release as part of v0.1b5

[ibboard]

Mark fix as released under a previous version