add config file setting to disable Fyne DPI detection

backend/config.go

@@ -52,6 +52,7 @@ type AppConfig struct {
 	SkipSSLVerify               bool
 	EnqueueBatchSize            int
 	Language                    string
+	DisableDPIDetection         bool
 
 	// Experimental - may be removed in future
 	FontNormalTTF string

main.go

@@ -47,6 +47,10 @@ func main() {
 		os.Setenv("FYNE_SCALE", "1.1")
 	}
 
+	if myApp.Config.Application.DisableDPIDetection {
+		os.Setenv("FYNE_DISABLE_DPI_DETECTION", "true")
+	}
+
 	// load configured app language, or all otherwise
 	lIdx := slices.IndexFunc(res.TranslationsInfo, func(t res.TranslationInfo) bool {
 		return t.Name == myApp.Config.Application.Language