Support multiple contexts within one command, add tests, update doc

pkg/integration/tests/custom_commands/multiple_contexts.go

@@ -0,0 +1,58 @@
+package custom_commands
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var MultipleContexts = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Test that multiple contexts works",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("my change")
+	},
+	SetupConfig: func(cfg *config.AppConfig) {
+		cfg.UserConfig.CustomCommands = []config.CustomCommand{
+			{
+				Key:        "X",
+				Context:    "commits, reflogCommits",
+				Command:    "touch myfile",
+				ShowOutput: false,
+			},
+		}
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		// commits
+		t.Views().Commits().
+			Focus().
+			Press("X")
+
+		t.Views().Files().
+			Focus().
+			Lines(Contains("myfile"))
+
+		t.Shell().DeleteFile("myfile")
+		t.GlobalPress(keys.Files.RefreshFiles)
+
+		// branches
+		t.Views().Branches().
+			Focus().
+			Press("X")
+
+		t.Views().Files().
+			Focus().
+			IsEmpty()
+
+		// files
+		t.Views().ReflogCommits().
+			Focus().
+			Press("X")
+
+		t.Views().Files().
+			Focus().
+			Lines(Contains("myfile"))
+
+		t.Shell().DeleteFile("myfile")
+	},
+})