Parameter error boxes are too small for error

[smk78]

In 4.2.0 on Mac and Win. Reported by a User and verified by @smk78.

When fitting, the parameter error (uncertainty) can sometimes have too many digits to be displayed in full in the box on the FitPage. This is most noticeable, and most irritating, when the error value is in scientific notation, because the exponent gets truncated! Example attached.

Either we need larger boxes, boxes that dynamically adjust their size, or to apply some mantissa formatting to the values displayed.

As an aside, in fixing #1070 we removed the ability to select and copy the value displayed…

[smk78]

Screenshot illustrating a truncated parameter uncertainty