Expose the missing whole-file semantics in the focused diff

The patch-building panel could move an added file as a file, while
selecting every visible change through the focused diff currently moves
only its content and leaves the empty file behind. Keep the intended
index state beside the current one so the replacement flow demonstrates
that gap before it is fixed.

Co-Authored-By: GitHub Copilot <copilot@github.com>

pkg/integration/tests/main_view/move_patch_to_index.go

@@ -1,11 +1,11 @@
-package patch_building
+package main_view
 
 import (
 	"github.com/jesseduffield/lazygit/pkg/config"
 	. "github.com/jesseduffield/lazygit/pkg/integration/components"
 )
 
-var MoveToIndex = NewIntegrationTest(NewIntegrationTestArgs{
+var MovePatchToIndex = NewIntegrationTest(NewIntegrationTestArgs{
 	Description:  "Move a patch from a commit to the index",
 	ExtraCmdArgs: []string{},
 	Skip:         false,
@@ -30,39 +30,32 @@ var MoveToIndex = NewIntegrationTest(NewIntegrationTestArgs{
 				Contains("file1"),
 				Contains("file2"),
 			).
-			SelectNextItem().
+			Press(keys.Universal.FocusMainView)
+
+		t.Views().Main().
+			IsFocused().
+			SelectedLines(Contains("+file1 content")).
 			PressPrimaryAction()
 
 		t.Views().Information().Content(Contains("Building patch"))
-
 		t.Views().Secondary().Content(Contains("+file1 content"))
 
 		t.Common().SelectPatchOption(Contains("Move patch out into index"))
 
-		t.Views().Files().
-			Lines(
-				Contains("A").Contains("file1"),
-			)
-
-		t.Views().CommitFiles().
-			IsFocused().
-			Lines(
-				Contains("file2").IsSelected(),
-			).
-			PressEscape()
-
+		t.Views().Files().Lines(
+			/* EXPECTED:
+			Contains("A").Contains("file1"),
+			ACTUAL: */
+			Contains("M").Contains("file1"),
+		)
 		t.Views().Main().
+			IsFocused().
 			Content(Contains("+file2 content"))
+		t.Views().Commits().Lines(
+			Contains("first commit").IsSelected(),
+		)
 
-		t.Views().Commits().
-			Lines(
-				Contains("first commit").IsSelected(),
-			)
-
-		t.Views().Files().
-			Focus()
-
-		t.Views().Secondary().
-			Content(Contains("file1 content"))
+		t.Views().Files().Focus()
+		t.Views().Secondary().Content(Contains("file1 content"))
 	},
 })

pkg/integration/tests/test_list.go

@@ -410,6 +410,7 @@ var tests = []*components.IntegrationTest{
 	main_view.KeepSelectionAfterMovingPatchOut,
 	main_view.KeepSelectionVisibleWhenDiffShrinks,
 	main_view.MoveOnWhenThePatchMarksRewrapTheDiff,
+	main_view.MovePatchToIndex,
 	main_view.NavigateByHunkAndFile,
 	main_view.NoSelectionOverABinaryDiff,
 	main_view.NoSelectionOverACommitLog,
@@ -477,7 +478,6 @@ var tests = []*components.IntegrationTest{
 	patch_building.MoveRangeToIndex,
 	patch_building.MoveToEarlierCommit,
 	patch_building.MoveToEarlierCommitFromAddedFile,
-	patch_building.MoveToIndex,
 	patch_building.MoveToIndexFromAddedFileWithConflict,
 	patch_building.MoveToIndexPartOfAdjacentAddedLines,
 	patch_building.MoveToIndexPartial,