Fix TreeItem markup + css

Author: bendera

src/vscode-tree-item/vscode-tree-item.styles.ts

@@ -34,8 +34,8 @@ const styles: CSSResultGroup = [
       font-family: var(--vscode-font-family, sans-serif);
       font-size: var(--vscode-font-size, 13px);
       font-weight: var(--vscode-font-weight, normal);
-      height: 22px;
       line-height: 22px;
+      min-height: 22px;
       outline-offset: -1px;
       padding-right: 12px;
     }

src/vscode-tree-item/vscode-tree-item.ts

@@ -682,12 +682,12 @@ export class VscodeTreeItem extends VscElement {
                 'arrow-container': true,
                 'icon-rotated': this.open,
               })}
-              part="head expando"
+              part="arrow-icon-container"
             >
               ${arrowIcon}
             </div>`
           : nothing}
-        <div class=${classMap(iconContainerClasses)} part="head icon">
+        <div class=${classMap(iconContainerClasses)} part="icon-container">
           ${this.branch && !this.open
             ? html`<slot
                 name="icon-branch"