Demonstrate that a commit list's columns are as wide as the visible lines need

The commits panel renders only the lines that are on screen, so the width
of a column follows what happens to be visible, and a column all of whose
visible lines are empty disappears altogether. Scrolling past the pending
rebase todos takes the action column away with them, and everything to its
right jumps to the left.

Cover the same problem for two more columns: the hash column, which goes
away while only hashless todos such as "update-ref" are on screen, and the
date column in the expanded commits panel, which is as narrow as the time
format while only commits from today are on screen.

This file is deliberately left un-gofumpt'd: gofumpt indents the body of
the commented-out block by a tab, which would fill the diff of the commit
that swaps the two blocks with whitespace-only changes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

pkg/gui/presentation/commits_test.go

@@ -274,6 +274,12 @@ func TestGetCommitListDisplayStrings(t *testing.T) {
 			bisectInfo:                git_commands.NewNullBisectInfo(),
 			cherryPickedCommitHashSet: set.New[string](),
 			now:                       time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC),
+			/* EXPECTED:
+			expected: formatExpected(`
+		hash4      ○ commit4
+		hash5      ○ commit5
+				`),
+			ACTUAL: */
 			expected: formatExpected(`
 		hash4 ○ commit4
 		hash5 ○ commit5
@@ -338,6 +344,31 @@ func TestGetCommitListDisplayStrings(t *testing.T) {
 			hash2 pick commit2
 				`),
 		},
+		{
+			testName: "only showing TODO commits that have no hash",
+			commitOpts: []models.NewCommitOpts{
+				{Name: "refs/heads/branch1", Action: todo.UpdateRef},
+				{Name: "refs/heads/branch2", Action: todo.UpdateRef},
+				{Name: "commit1", Hash: "hash1", Parents: []string{"hash2"}, Action: todo.Pick},
+				{Name: "commit2", Hash: "hash2", Parents: []string{"hash3"}},
+			},
+			startIdx:                  0,
+			endIdx:                    2,
+			showGraph:                 false,
+			bisectInfo:                git_commands.NewNullBisectInfo(),
+			cherryPickedCommitHashSet: set.New[string](),
+			now:                       time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC),
+			/* EXPECTED:
+			expected: formatExpected(`
+		      update-ref branch1
+		      update-ref branch2
+				`),
+			ACTUAL: */
+			expected: formatExpected(`
+		update-ref branch1
+		update-ref branch2
+				`),
+		},
 		{
 			testName: "graph in divergence view - all commits visible",
 			commitOpts: []models.NewCommitOpts{
@@ -530,6 +561,30 @@ func TestGetCommitListDisplayStrings(t *testing.T) {
 		hash2 2019-12-20 Jesse Duffield    commit2
 						`),
 		},
+		{
+			testName: "only showing commits from today",
+			commitOpts: []models.NewCommitOpts{
+				{Name: "commit1", Hash: "hash1", UnixTimestamp: 1577844184, AuthorName: "Jesse Duffield"},
+				{Name: "commit2", Hash: "hash2", UnixTimestamp: 1576844184, AuthorName: "Jesse Duffield"},
+			},
+			fullDescription:           true,
+			timeFormat:                "2006-01-02",
+			shortTimeFormat:           "3:04PM",
+			startIdx:                  0,
+			endIdx:                    1,
+			showGraph:                 false,
+			bisectInfo:                git_commands.NewNullBisectInfo(),
+			cherryPickedCommitHashSet: set.New[string](),
+			now:                       time.Date(2020, 1, 1, 5, 3, 4, 0, time.UTC),
+			/* EXPECTED:
+			expected: formatExpected(`
+		hash1 2:03AM     Jesse Duffield    commit1
+						`),
+			ACTUAL: */
+			expected: formatExpected(`
+		hash1 2:03AM Jesse Duffield    commit1
+						`),
+		},
 	}
 
 	oldColorLevel := color.ForceSetColorLevel(terminfo.ColorLevelNone)