Use character display width for table padding

Using len(...) for table cell padding produced wrong results for unicode
chracters leading to misaligned tables. Implementation changed to take
the actual terminal display width into consideration.

internal/ui/table/table.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 
 	"text/template"
+
+	"github.com/restic/restic/internal/ui"
 )
 
 // Table contains data for a table to be printed.
@@ -89,7 +91,7 @@ func printLine(w io.Writer, print func(io.Writer, string) error, sep string, dat
 			}
 
 			// apply padding
-			pad := widths[fieldNum] - len(v)
+			pad := widths[fieldNum] - ui.TerminalDisplayWidth(v)
 			if pad > 0 {
 				v += strings.Repeat(" ", pad)
 			}
@@ -139,16 +141,16 @@ func (t *Table) Write(w io.Writer) error {
 	columnWidths := make([]int, columns)
 	for i, desc := range t.columns {
 		for _, line := range strings.Split(desc, "\n") {
-			if columnWidths[i] < len(line) {
-				columnWidths[i] = len(desc)
+			if columnWidths[i] < ui.TerminalDisplayWidth(line) {
+				columnWidths[i] = ui.TerminalDisplayWidth(desc)
 			}
 		}
 	}
 	for _, line := range lines {
 		for i, content := range line {
 			for _, l := range strings.Split(content, "\n") {
-				if columnWidths[i] < len(l) {
-					columnWidths[i] = len(l)
+				if columnWidths[i] < ui.TerminalDisplayWidth(l) {
+					columnWidths[i] = ui.TerminalDisplayWidth(l)
 				}
 			}
 		}
@@ -159,7 +161,7 @@ func (t *Table) Write(w io.Writer) error {
 	for _, width := range columnWidths {
 		totalWidth += width
 	}
-	totalWidth += (columns - 1) * len(t.CellSeparator)
+	totalWidth += (columns - 1) * ui.TerminalDisplayWidth(t.CellSeparator)
 
 	// write header
 	if len(t.columns) > 0 {