lock widths

Selectively lock/unlock glyph widths across all layers of selected glyphs.

RF3 RoboFont 3 code which still works in RoboFont 4. Not updated to the new RoboFont 4 APIs yet.

lock
lock glyph widths across all layers
unlock
unlock glyph widths to allow different metrics across layers
preview
toggle the lock indicator on/off

Preview

Glyphs with locked layer widths are marked with a lock icon in the main editing windows.