fix retraction between widgets. put retraction in prepare instead of export. inline comments

src/mode/fdm/export.js

@@ -212,9 +212,6 @@
         let angle = -Math.PI / 4;
 
         function moveTo(newpos, rate, comment) {
-            if (comment) {
-                append(";; " + comment);
-            }
             let o = [!rate && !newpos.e ? 'G0' : 'G1'];
             let emit = { x: false, y: false, z: false };
             if (typeof newpos.x === 'number' && newpos.x !== pos.x) {
@@ -254,6 +251,9 @@
                 o.append(" F").append(Math.round(rate));
                 pos.f = rate
             }
+            if (comment) {
+                o.append(` ; ${comment}`);
+            }
             let line = o.join('');
             if (last == line) {
                 // console.log({dup:line});
@@ -325,10 +325,6 @@
                 append(`;; --- layer ${layer} (${subst.height} @ ${subst.z.round(3)}) ---`);
             }
 
-            if (layer > 0 && process.outputLayerRetract) {
-                retract();
-            }
-
             // enable fan at fan layer
             if (gcodeFan && layer === process.outputFanLayer) {
                 appendAllSub(gcodeFan);