Add a command to select all commits of the current branch

This is useful for seeing the combined diff of all commits of a branch.

pkg/integration/tests/branch/select_commits_of_current_branch.go

@@ -0,0 +1,74 @@
+package branch
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var SelectCommitsOfCurrentBranch = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Select all commits of the current branch",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("master 01")
+		shell.EmptyCommit("master 02")
+		shell.NewBranch("branch1")
+		shell.CreateNCommits(2)
+		shell.NewBranchFrom("branch2", "master")
+		shell.CreateNCommits(3)
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().
+			Focus().
+			Lines(
+				Contains("commit 03").IsSelected(),
+				Contains("commit 02"),
+				Contains("commit 01"),
+				Contains("master 02"),
+				Contains("master 01"),
+			).
+			Press(keys.Commits.SelectCommitsOfCurrentBranch).
+			Lines(
+				Contains("commit 03").IsSelected(),
+				Contains("commit 02").IsSelected(),
+				Contains("commit 01").IsSelected(),
+				Contains("master 02"),
+				Contains("master 01"),
+			).
+			PressEscape().
+			Lines(
+				Contains("commit 03").IsSelected(),
+				Contains("commit 02"),
+				Contains("commit 01"),
+				Contains("master 02"),
+				Contains("master 01"),
+			)
+
+		t.Views().Branches().
+			Focus().
+			Lines(
+				Contains("branch2").IsSelected(),
+				Contains("branch1"),
+				Contains("master"),
+			).
+			SelectNextItem().
+			PressEnter()
+
+		t.Views().SubCommits().
+			IsFocused().
+			Lines(
+				Contains("commit 02").IsSelected(),
+				Contains("commit 01"),
+				Contains("master 02"),
+				Contains("master 01"),
+			).
+			Press(keys.Commits.SelectCommitsOfCurrentBranch).
+			Lines(
+				Contains("commit 02").IsSelected(),
+				Contains("commit 01").IsSelected(),
+				Contains("master 02"),
+				Contains("master 01"),
+			)
+	},
+})