🐛 Fix zindex of each components

Author: lambdalisue

denops/fall/main/picker.ts

@@ -94,9 +94,9 @@ async function startPicker(
     }),
   );
 
-  zindex++;
+  zindex += 5;
   stack.defer(() => {
-    zindex--;
+    zindex -= 5;
   });
   stack.use(await itemPicker.open(denops, { signal }));
   while (true) {

denops/fall/picker.ts

@@ -68,6 +68,7 @@ export class Picker<T> implements AsyncDisposable {
     this.#name = params.name;
     this.#layout = params.layout;
 
+    const zindex = params.zindex ?? 50;
     const { screen, theme } = params;
     const isPreviewRequired = !!params.previewer;
     const borders = isPreviewRequired
@@ -81,22 +82,22 @@ export class Picker<T> implements AsyncDisposable {
         dimension: dimensions.input,
         border: borders.input,
         title: this.#name,
-        zindex: params.zindex,
+        zindex,
       }),
     );
     this.#listComponent = this.#stack.use(
       new ListComponent({
         dimension: dimensions.list,
         border: borders.list,
-        zindex: params.zindex,
+        zindex: zindex + 1,
       }),
     );
     if ("preview" in dimensions && "preview" in borders) {
       this.#previewComponent = this.#stack.use(
         new PreviewComponent({
           dimension: dimensions.preview as Dimension,
           border: borders.preview as Border,
-          zindex: params.zindex,
+          zindex: zindex + 2,
         }),
       );
     }