Issue #2470 - Spacing between grid lines does not stay at 1px ...
... as I would like it to. Use GimpSpinButton, added in the previous commit, in GimpSizeEntry, instead of GtkSpinButton. This avoids updating the spin-buttons' adjustment values when they lose focus, truncating the value if it can't be accurately displayed using the corresponding spin-button's digit count. Since size-entries can have multiple spin-buttons using different units, this prevents the value from changing when entring a value using one unit, and then shifting the focus to, but not changing, another unit.
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