add contextual menu to remove all glyph layer data for the selected glyphs

RemoveGlyphLayersSubscriber.py

from mojo.subscriber import Subscriber, registerRoboFontSubscriber


class RemoveGlyphLayersSubscriber(Subscriber):
    
    debug = True
    
    def fontOverviewWantsContextualMenuItems(self, items):
        if items["itemDescriptions"]:
            items["itemDescriptions"].append("---")
        items["itemDescriptions"].append(("Remove Layers for Glyphs", self.removeLayerForGlyphs))
    
    def removeLayerForGlyphs(self, sender):
        font = CurrentFont()
        glyphNames = font.selectedGlyphNames
        if not glyphNames:
            glyphNames = font.keys()
        
        removedGlyphNames = set()       
        for layer in font.layers:
            if layer == font.defaultLayer:
                continue        
            for glyphName in glyphNames:
                if glyphName in layer:
                    del layer[glyphName]
                    removedGlyphNames.add(glyphName)
            
        with font.holdChanges():
            for glyphName in removedGlyphNames:
                font[glyphName].changed()
                

registerRoboFontSubscriber(RemoveGlyphLayersSubscriber)