Add Collapse All button in tree views (#443)

* Add configuration option to show/hide Collapse All button in tree views

* resolve PR review identified improvements

* remove configuration option for Collapse All and default to enabled

* revert unnecessary collapse on Help

* remove unnecessary newline

Author: mathiscode

src/tree/registerTrees.ts

@@ -23,21 +23,21 @@ export function registerTrees(): void {
     ext.containersRoot = new ContainersTreeItem(undefined);
     const containersLoadMore = 'vscode-containers.containers.loadMore';
     ext.containersTree = new AzExtTreeDataProvider(ext.containersRoot, containersLoadMore);
-    ext.containersTreeView = vscode.window.createTreeView('vscode-containers.views.containers', { treeDataProvider: ext.containersTree, canSelectMany: true });
+    ext.containersTreeView = vscode.window.createTreeView('vscode-containers.views.containers', { treeDataProvider: ext.containersTree, canSelectMany: true, showCollapseAll: true });
     ext.context.subscriptions.push(ext.containersTreeView);
     registerCommand(containersLoadMore, async (context: IActionContext, node: AzExtTreeItem) => ext.containersTree.loadMore(node, context));
 
     ext.networksRoot = new NetworksTreeItem(undefined);
     const networksLoadMore = 'vscode-containers.networks.loadMore';
     ext.networksTree = new AzExtTreeDataProvider(ext.networksRoot, networksLoadMore);
-    ext.networksTreeView = vscode.window.createTreeView('vscode-containers.views.networks', { treeDataProvider: ext.networksTree, canSelectMany: true });
+    ext.networksTreeView = vscode.window.createTreeView('vscode-containers.views.networks', { treeDataProvider: ext.networksTree, canSelectMany: true, showCollapseAll: true });
     ext.context.subscriptions.push(ext.networksTreeView);
     registerCommand(networksLoadMore, async (context: IActionContext, node: AzExtTreeItem) => ext.networksTree.loadMore(node, context));
 
     ext.imagesRoot = new ImagesTreeItem(undefined);
     const imagesLoadMore = 'vscode-containers.images.loadMore';
     ext.imagesTree = new AzExtTreeDataProvider(ext.imagesRoot, imagesLoadMore);
-    ext.imagesTreeView = vscode.window.createTreeView('vscode-containers.views.images', { treeDataProvider: ext.imagesTree, canSelectMany: true });
+    ext.imagesTreeView = vscode.window.createTreeView('vscode-containers.views.images', { treeDataProvider: ext.imagesTree, canSelectMany: true, showCollapseAll: true });
     ext.context.subscriptions.push(ext.imagesTreeView);
     registerCommand(imagesLoadMore, async (context: IActionContext, node: AzExtTreeItem) => ext.imagesTree.loadMore(node, context));
 
@@ -50,14 +50,14 @@ export function registerTrees(): void {
     ext.volumesRoot = new VolumesTreeItem(undefined);
     const volumesLoadMore = 'vscode-containers.volumes.loadMore';
     ext.volumesTree = new AzExtTreeDataProvider(ext.volumesRoot, volumesLoadMore);
-    ext.volumesTreeView = vscode.window.createTreeView('vscode-containers.views.volumes', { treeDataProvider: ext.volumesTree, canSelectMany: true });
+    ext.volumesTreeView = vscode.window.createTreeView('vscode-containers.views.volumes', { treeDataProvider: ext.volumesTree, canSelectMany: true, showCollapseAll: true });
     ext.context.subscriptions.push(ext.volumesTreeView);
     registerCommand(volumesLoadMore, async (context: IActionContext, node: AzExtTreeItem) => ext.volumesTree.loadMore(node, context));
 
     ext.contextsRoot = new ContextsTreeItem(undefined);
     const contextsLoadMore = 'vscode-containers.contexts.loadMore';
     ext.contextsTree = new AzExtTreeDataProvider(ext.contextsRoot, contextsLoadMore);
-    ext.contextsTreeView = vscode.window.createTreeView('vscode-containers.views.dockerContexts', { treeDataProvider: ext.contextsTree, canSelectMany: false });
+    ext.contextsTreeView = vscode.window.createTreeView('vscode-containers.views.dockerContexts', { treeDataProvider: ext.contextsTree, canSelectMany: false, showCollapseAll: true });
     ext.context.subscriptions.push(ext.contextsTreeView);
     registerCommand(contextsLoadMore, async (context: IActionContext, node: AzExtTreeItem) => ext.contextsTree.loadMore(node, context));