* claim: #2320
* Value fields step with the arrow keys and the mouse wheel (#2320)
Up/Down in a focused value field step a plain number by 1 in the unit it is written in
("20 mm" -> "21 mm", "2,5 mm" -> "3,5 mm"), 10 with Shift and 0.1 with Alt; the wheel over
the focused field does the same, a step a notch, instead of scrolling the panel under it.
Expressions such as `width / 2` are left as typed, and an open completion list keeps the
arrows. Every expression field gets this through `params_dialog::complete`: the value box
beside the geometry in every dialog, the dialog rows, sketch dimensions, the dimension
editor, Drive Joint and the Parameters window.
* The value box beside the geometry stays under the pointer
The box rides on the arrow's tip, so each wheel notch that stepped its value moved it, and
after a notch or two the box slid out from under the pointer and the wheel zoomed the view
instead. While the pointer is over it the box now keeps its place, and it goes back to the tip
when the pointer leaves.
* Value stepping is a preference, off by default
Preferences › General › "Step values with the arrow keys and the wheel" (`step_values`,
also through `ui.prefs`) turns on Up/Down and wheel stepping in value fields, and the value
box staying under the pointer while the wheel steps it. Off, as by default, value fields
behave as before: Up/Down move the text cursor, the wheel scrolls, and the box beside the
geometry follows its arrow.
* Value stepping test: Bend Radius is under Advanced now
* Value stepping test: the preference is on the Design page
* Value stepping test: draw the field straight into the test's frame (#2320)
The shared outer-host rule now covers tests too; the field needs no panel around it.
Ahmad Khan
a49698ee3d