Add tests demonstrating the problem

Trying to delete a remote tag when a remote branch with the same name exists
results in an error, and vice versa.

pkg/integration/tests/branch/delete_remote_branch_when_tag_with_same_name_exists.go

@@ -0,0 +1,54 @@
+package branch
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var DeleteRemoteBranchWhenTagWithSameNameExists = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Delete a remote branch when a remote tag with the same name exists",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("initial commit")
+		shell.CloneIntoRemote("origin")
+		shell.CreateLightweightTag("xyz", "HEAD")
+		shell.PushBranch("origin", "HEAD:refs/tags/xyz") // abusing PushBranch to push a tag
+		shell.PushBranch("origin", "HEAD:refs/heads/xyz")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Remotes().
+			Focus().
+			Lines(
+				Contains("origin").IsSelected(),
+			).
+			PressEnter()
+
+		t.Views().RemoteBranches().
+			IsFocused().
+			Lines(
+				Contains("master").IsSelected(),
+				Contains("xyz"),
+			).
+			SelectNextItem().
+			Press(keys.Universal.Remove)
+
+		t.ExpectPopup().
+			Confirmation().
+			Title(Equals("Delete branch 'xyz'?")).
+			Content(Equals("Are you sure you want to delete the remote branch 'xyz' from 'origin'?")).
+			Confirm()
+
+		/* EXPECTED:
+		t.Views().RemoteBranches().
+			Lines(
+				Contains("master").IsSelected(),
+			)
+		ACTUAL: */
+		t.ExpectPopup().Alert().
+			Title(Equals("Error")).
+			Content(Contains("error: dst refspec xyz matches more than one")).
+			Confirm()
+	},
+})

pkg/integration/tests/tag/delete_remote_tag_when_branch_with_same_name_exists.go

@@ -0,0 +1,58 @@
+package tag
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var DeleteRemoteTagWhenBranchWithSameNameExists = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Delete a remote tag when a remote branch with the same name exists",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.EmptyCommit("initial commit")
+		shell.CloneIntoRemote("origin")
+		shell.CreateLightweightTag("xyz", "HEAD")
+		shell.PushBranch("origin", "HEAD:refs/tags/xyz") // abusing PushBranch to push a tag
+		shell.PushBranch("origin", "HEAD:refs/heads/xyz")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Tags().
+			Focus().
+			Lines(
+				Contains("xyz").IsSelected(),
+			).
+			Press(keys.Universal.Remove)
+
+		t.ExpectPopup().
+			Menu().
+			Title(Equals("Delete tag 'xyz'?")).
+			Select(Contains("Delete remote tag")).
+			Confirm()
+
+		t.ExpectPopup().Prompt().
+			Title(Equals("Remote from which to remove tag 'xyz':")).
+			InitialText(Equals("origin")).
+			SuggestionLines(
+				Contains("origin"),
+			).
+			Confirm()
+
+		t.ExpectPopup().
+			Confirmation().
+			Title(Equals("Delete tag 'xyz'?")).
+			Content(Equals("Are you sure you want to delete the remote tag 'xyz' from 'origin'?")).
+			Confirm()
+
+		/* EXPECTED:
+		t.ExpectToast(Equals("Remote tag deleted"))
+
+		t.Shell().AssertRemoteTagNotFound("origin", "xyz")
+		ACTUAL: */
+		t.ExpectPopup().Alert().
+			Title(Equals("Error")).
+			Content(Contains("error: dst refspec xyz matches more than one")).
+			Confirm()
+	},
+})

pkg/integration/tests/test_list.go

@@ -45,6 +45,7 @@ var tests = []*components.IntegrationTest{
 	branch.CreateTag,
 	branch.Delete,
 	branch.DeleteMultiple,
+	branch.DeleteRemoteBranchWhenTagWithSameNameExists,
 	branch.DeleteRemoteBranchWithCredentialPrompt,
 	branch.DeleteRemoteBranchWithDifferentName,
 	branch.DeleteWhileFiltering,
@@ -430,6 +431,7 @@ var tests = []*components.IntegrationTest{
 	tag.CrudAnnotated,
 	tag.CrudLightweight,
 	tag.DeleteLocalAndRemote,
+	tag.DeleteRemoteTagWhenBranchWithSameNameExists,
 	tag.ForceTagAnnotated,
 	tag.ForceTagLightweight,
 	tag.Reset,