fix: broken automerge logic (#3591)

* fix automerge logic.

* address failing autoplan test with automerge

server/events/automerger.go

@@ -46,14 +46,10 @@ func (c *AutoMerger) automerge(ctx *command.Context, pullStatus models.PullStatu
 
 // automergeEnabled returns true if automerging is enabled in this context.
 func (c *AutoMerger) automergeEnabled(projectCmds []command.ProjectContext) bool {
-	// only automerge if all projects have automerge set; or if global automerge is set and there are no projects.
+	// Use project automerge settings if projects exist; otherwise, use global automerge settings.
 	automerge := c.GlobalAutomerge
 	if len(projectCmds) > 0 {
-		for _, prjCmd := range projectCmds {
-			if !prjCmd.AutomergeEnabled {
-				automerge = false
-			}
-		}
+		automerge = projectCmds[0].AutomergeEnabled
 	}
 	return automerge
 }

server/events/command_runner_test.go

@@ -695,16 +695,17 @@ func TestRunAutoplanCommandWithError_DeletePlans(t *testing.T) {
 	Ok(t, err)
 	dbUpdater.Backend = boltDB
 	applyCommandRunner.Backend = boltDB
-	autoMerger.GlobalAutomerge = true
 	defer func() { autoMerger.GlobalAutomerge = false }()
 
 	When(projectCommandBuilder.BuildAutoplanCommands(Any[*command.Context]())).
 		ThenReturn([]command.ProjectContext{
 			{
-				CommandName: command.Plan,
+				CommandName:      command.Plan,
+				AutomergeEnabled: true, // Setting this manually, since this tests bypasses automerge param reconciliation logic and otherwise defaults to false.
 			},
 			{
-				CommandName: command.Plan,
+				CommandName:      command.Plan,
+				AutomergeEnabled: true, // Setting this manually, since this tests bypasses automerge param reconciliation logic and otherwise defaults to false.
 			},
 		}, nil)
 	callCount := 0