Adds compare button to compare view

package.json

@@ -2369,6 +2369,15 @@
                 "category": "GitLens"
             },
             {
+                "command": "gitlens.views.compare.selectForCompare",
+                "title": "Compare Branch or Tag with...",
+                "category": "GitLens",
+                "icon": {
+                    "dark": "images/dark/icon-compare-refs.svg",
+                    "light": "images/light/icon-compare-refs.svg"
+                }
+            },
+            {
                 "command": "gitlens.views.compare.clear",
                 "title": "Clear Results",
                 "category": "GitLens",
@@ -2990,6 +2999,10 @@
                     "when": "false"
                 },
                 {
+                    "command": "gitlens.views.compare.selectForCompare",
+                    "when": "gitlens:enabled && gitlens.views.compare.enabled"
+                },
+                {
                     "command": "gitlens.views.compare.clear",
                     "when": "false"
                 },
@@ -3399,6 +3412,11 @@
                     "group": "1_gitlens"
                 },
                 {
+                    "command": "gitlens.views.compare.selectForCompare",
+                    "when": "view =~ /^gitlens\\.views\\.compare:/",
+                    "group": "navigation@1"
+                },
+                {
                     "command": "gitlens.views.compare.clear",
                     "when": "view =~ /^gitlens\\.views\\.compare:/",
                     "group": "navigation@2"

src/views/nodes/compareNode.ts

@@ -148,6 +148,7 @@ export class CompareNode extends ViewNode {
         }
         if (repoPath === undefined) return;
 
+        let autoCompare = false;
         if (ref === undefined) {
             const pick = await new BranchesAndTagsQuickPick(repoPath).show(
                 `Select branch or tag for compare${GlyphChars.Ellipsis}`
@@ -155,6 +156,8 @@ export class CompareNode extends ViewNode {
             if (pick === undefined || pick instanceof CommandQuickPickItem) return;
 
             ref = pick.name;
+
+            autoCompare = true;
         }
 
         this._selectedRef = { label: this.getRefName(ref), repoPath: repoPath, ref: ref };
@@ -163,6 +166,10 @@ export class CompareNode extends ViewNode {
         await this.view.show();
 
         void (await this.triggerChange());
+
+        if (autoCompare) {
+            void (await this.compareWithSelected());
+        }
     }
 
     private getRefName(ref: string | NamedRef) {