Make the local-commits limit-commits flag atomic

CheckoutRef and ResetToRef set this flag from their worker goroutine
(to load fewer commits for speed) while the commits refresh reads it on
the UI thread in captureCommitsState to decide how many to load — a data
race. Make it an atomic.Bool so those writes are safe where they are,
rather than routing the flag through a refresh intent. Precedent:
Branch.BehindBaseBranch.

pkg/gui/context/local_commits_context.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"strings"
+	"sync/atomic"
 	"time"
 
 	"github.com/jesseduffield/lazygit/pkg/commands/models"
@@ -142,7 +143,9 @@ type LocalCommitsViewModel struct {
 
 	// If this is true we limit the amount of commits we load, for the sake of keeping things fast.
 	// If the user attempts to scroll past the end of the list, we will load more commits.
-	limitCommits bool
+	// Atomic because a checkout or reset sets it from a worker goroutine while the
+	// commits refresh reads it on the UI thread to decide how many commits to load.
+	limitCommits atomic.Bool
 
 	// If this is true we'll use git log --all when fetching the commits.
 	showWholeGitGraph bool
@@ -151,9 +154,9 @@ type LocalCommitsViewModel struct {
 func NewLocalCommitsViewModel(getModel func() []*models.Commit, c *ContextCommon) *LocalCommitsViewModel {
 	self := &LocalCommitsViewModel{
 		ListViewModel:     NewListViewModel(getModel),
-		limitCommits:      true,
 		showWholeGitGraph: c.UserConfig().Git.Log.ShowWholeGraph,
 	}
+	self.limitCommits.Store(true)
 
 	return self
 }
@@ -225,11 +228,11 @@ func (self *LocalCommitsContext) ModelSearchResults(searchStr string, caseSensit
 }
 
 func (self *LocalCommitsViewModel) SetLimitCommits(value bool) {
-	self.limitCommits = value
+	self.limitCommits.Store(value)
 }
 
 func (self *LocalCommitsViewModel) GetLimitCommits() bool {
-	return self.limitCommits
+	return self.limitCommits.Load()
 }
 
 func (self *LocalCommitsViewModel) SetShowWholeGitGraph(value bool) {