Changes to cell_test.go. All files

cell_test.go

@@ -349,3 +349,33 @@ func TestCellBufferFillAreaColorNone(t *testing.T) { 		t.Fatalf("ColorNone should preserve existing colors, got %v", style) 	} }++func TestCellBufferRePutAfterClear(t *testing.T) {+	cb := &CellBuffer{}+	cb.Resize(4, 1)+	for _, str := range []string{"宽", "🎉", "👩‍👩‍👧‍👦", "e\u0301"} {+		_, want := cb.Put(0, 0, str, StyleDefault)+		cb.SetDirty(0, 0, false) // drawn++		// Putting back what is on screen after a Clear reuses the width+		// measured when it was drawn.+		cb.Put(0, 0, " ", StyleDefault) // what Clear leaves+		if rest, width := cb.Put(0, 0, str, StyleDefault); rest != "" || width != want {+			t.Errorf("%q: got %q, %d after clearing, want \"\", %d", str, rest, width, want)+		}+	}+}++func TestCellBufferRePutAfterRedrawMarker(t *testing.T) {+	cb := &CellBuffer{}+	cb.Resize(4, 1)+	cb.Put(0, 0, "宽", StyleDefault)+	cb.SetDirty(0, 0, false) // drawn, two columns wide++	// Marking the cell for redraw sets lastStr to "", which must not keep+	// the width of what was drawn.+	cb.SetDirty(0, 0, true)+	if _, width := cb.Put(0, 0, "", StyleDefault); width != 0 {+		t.Fatalf("empty string width %d, want 0", width)+	}+}