Closes #4779 adds arbitrary comparison support

 - Adds "Select for Compare"/"Compare with Selected" to the Graph context menu for commits, stashes, branches, and tags

Author: eamodio

contributions.json

@@ -8234,6 +8234,18 @@
 				]
 			}
 		},
+		"gitlens.views.compareWithSelected:graph": {
+			"label": "Compare with Selected",
+			"menus": {
+				"webview/context": [
+					{
+						"when": "webviewItem =~ /gitlens:(branch|commit|stash|tag)\\b/ && !listMultiSelection && gitlens:views:canCompare",
+						"group": "4_gitlens_compare",
+						"order": 98
+					}
+				]
+			}
+		},
 		"gitlens.views.compareWithUpstream": {
 			"label": "Compare with Upstream",
 			"menus": {
@@ -15165,6 +15177,18 @@
 				]
 			}
 		},
+		"gitlens.views.selectForCompare:graph": {
+			"label": "Select for Compare",
+			"menus": {
+				"webview/context": [
+					{
+						"when": "webviewItem =~ /gitlens:(branch|commit|stash|tag)\\b/ && !listMultiSelection",
+						"group": "4_gitlens_compare",
+						"order": 99
+					}
+				]
+			}
+		},
 		"gitlens.views.setAsDefault": {
 			"label": "Set as Default",
 			"menus": {

package.json

@@ -8971,6 +8971,10 @@
 				"command": "gitlens.views.compareWithSelected",
 				"title": "Compare with Selected"
 			},
+			{
+				"command": "gitlens.views.compareWithSelected:graph",
+				"title": "Compare with Selected"
+			},
 			{
 				"command": "gitlens.views.compareWithUpstream",
 				"title": "Compare with Upstream"
@@ -10571,6 +10575,10 @@
 				"command": "gitlens.views.selectForCompare",
 				"title": "Select for Compare"
 			},
+			{
+				"command": "gitlens.views.selectForCompare:graph",
+				"title": "Select for Compare"
+			},
 			{
 				"command": "gitlens.views.setAsDefault",
 				"title": "Set as Default"
@@ -13688,6 +13696,10 @@
 					"command": "gitlens.views.compareWithSelected",
 					"when": "false"
 				},
+				{
+					"command": "gitlens.views.compareWithSelected:graph",
+					"when": "false"
+				},
 				{
 					"command": "gitlens.views.compareWithUpstream",
 					"when": "false"
@@ -15024,6 +15036,10 @@
 					"command": "gitlens.views.selectForCompare",
 					"when": "false"
 				},
+				{
+					"command": "gitlens.views.selectForCompare:graph",
+					"when": "false"
+				},
 				{
 					"command": "gitlens.views.setAsDefault",
 					"when": "false"
@@ -24871,6 +24887,16 @@
 					"when": "webviewItem =~ /gitlens:branch\\b(?!.*?\\b\\+current\\b)/ && !gitlens:hasVirtualFolders",
 					"group": "4_gitlens_compare@5"
 				},
+				{
+					"command": "gitlens.views.compareWithSelected:graph",
+					"when": "webviewItem =~ /gitlens:(branch|commit|stash|tag)\\b/ && !listMultiSelection && gitlens:views:canCompare",
+					"group": "4_gitlens_compare@98"
+				},
+				{
+					"command": "gitlens.views.selectForCompare:graph",
+					"when": "webviewItem =~ /gitlens:(branch|commit|stash|tag)\\b/ && !listMultiSelection",
+					"group": "4_gitlens_compare@99"
+				},
 				{
 					"submenu": "gitlens/share",
 					"when": "webviewItem =~ /gitlens:(branch|commit|stash|tag|file\\b(?=.*?\\b\\+(committed|staged|unstaged)\\b))\\b/",

src/constants.commands.generated.ts

@@ -398,6 +398,7 @@ export type ContributedCommands =
 	| 'gitlens.views.compareWithHead'
 	| 'gitlens.views.compareWithMergeBase'
 	| 'gitlens.views.compareWithSelected'
+	| 'gitlens.views.compareWithSelected:graph'
 	| 'gitlens.views.compareWithUpstream'
 	| 'gitlens.views.compareWithWorking'
 	| 'gitlens.views.contributors.attach'
@@ -723,6 +724,7 @@ export type ContributedCommands =
 	| 'gitlens.views.selectFileForCompare:commitDetails'
 	| 'gitlens.views.selectFileForCompare:graphDetails'
 	| 'gitlens.views.selectForCompare'
+	| 'gitlens.views.selectForCompare:graph'
 	| 'gitlens.views.setAsDefault'
 	| 'gitlens.views.setBranchComparisonToBranch'
 	| 'gitlens.views.setBranchComparisonToWorking'

src/webviews/plus/graph/graphWebview.ts

@@ -126,7 +126,7 @@ import {
 	registerCommand,
 } from '../../../system/-webview/command';
 import { configuration } from '../../../system/-webview/configuration';
-import { getContext, onDidChangeContext } from '../../../system/-webview/context';
+import { getContext, onDidChangeContext, setContext } from '../../../system/-webview/context';
 import type { StorageChangeEvent } from '../../../system/-webview/storage';
 import { isDarkTheme, isLightTheme } from '../../../system/-webview/vscode';
 import type { OpenWorkspaceLocation } from '../../../system/-webview/vscode/workspaces';
@@ -639,6 +639,9 @@ export class GraphWebviewProvider implements WebviewProvider<State, State, Graph
 				this.compareAncestryWithWorking,
 			),
 
+			this.host.registerWebviewCommand('gitlens.views.selectForCompare:graph', this.selectForCompare),
+			this.host.registerWebviewCommand('gitlens.views.compareWithSelected:graph', this.compareWithSelected),
+
 			this.host.registerWebviewCommand('gitlens.graph.copy', this.copy),
 			this.host.registerWebviewCommand('gitlens.graph.copyMessage', this.copyMessage),
 			this.host.registerWebviewCommand('gitlens.graph.copySha', this.copySha),
@@ -4397,6 +4400,35 @@ export class GraphWebviewProvider implements WebviewProvider<State, State, Graph
 		return this.container.views.searchAndCompare.compare(ref.repoPath, '', ref.ref);
 	}
 
+	@log()
+	private selectForCompare(item?: GraphItemContext) {
+		const ref = this.getGraphItemRef(item);
+		if (ref == null) return;
+
+		void setContext('gitlens:views:canCompare', { label: ref.name, ref: ref.ref, repoPath: ref.repoPath });
+	}
+
+	@log()
+	private compareWithSelected(item?: GraphItemContext) {
+		const ref = this.getGraphItemRef(item);
+		if (ref == null) return;
+
+		const selectedRef = getContext('gitlens:views:canCompare');
+		if (selectedRef == null) return;
+
+		void setContext('gitlens:views:canCompare', undefined);
+
+		if (selectedRef.repoPath !== ref.repoPath) {
+			this.selectForCompare(item);
+			return;
+		}
+
+		void this.container.views.searchAndCompare.compare(ref.repoPath, selectedRef, {
+			label: ref.name,
+			ref: ref.ref,
+		});
+	}
+
 	@log()
 	private copyWorkingChangesToWorktree(item?: GraphItemContext) {
 		const ref = this.getGraphItemRef(item);