Fix build break (stack overflow) for no-cv-ss building (be5invis#2500)

Author: be5invis

.github/workflows/pr-build-validation.yml

@@ -10,7 +10,7 @@ jobs:
 
     strategy:
       matrix:
-        fontName: ["Iosevka", "IosevkaSlab", "IosevkaAile", "IosevkaEtoile"]
+        fontName: ["Iosevka", "IosevkaSlab", "IosevkaAile", "IosevkaEtoile", "IosevkaNoVarTest"]
 
     steps:
       # Checkout repository into `iosevka` sub directory

build-plans.toml

@@ -875,6 +875,13 @@ shape = 700
 menu = 700
 css = 700
 
+[buildPlans.IosevkaNoVarTest]
+family = "IosevkaNoVarTest"
+spacing = "normal"
+serifs = "sans"
+noCvSs = true
+exportGlyphNames = false
+
 ###################################################################################################
 # Collect plans
 

packages/glyph/src/glyph.mjs

@@ -145,7 +145,7 @@ export class Glyph {
 
 	tryBecomeMirrorOf(dst, rankSet) {
 		if (rankSet.has(this) || rankSet.has(dst)) return;
-		if (dst.hasDependency(this)) return;
+		if (this === dst || dst.hasDependency(this)) return;
 		const csThis = Geom.hashGeometry(this.geometry);
 		const csDst = Geom.hashGeometry(dst.geometry);
 		if (csThis && csDst && csThis === csDst) {