Convert tabs to spaces in WrapViewLinesToWidth

We haven't needed this before since we were only using the function for text in
confirmations and menus, which is unlikely to contain tabs. We are going to use
it for patches in the staging view though, which often do.

pkg/utils/lines.go

@@ -115,6 +115,15 @@ func WrapViewLinesToWidth(wrap bool, text string, width int) []string {
 	wrappedLines := make([]string, 0, len(lines))
 
 	for _, line := range lines {
+		// convert tabs to spaces
+		for i := 0; i < len(line); i++ {
+			if line[i] == '\t' {
+				numSpaces := 4 - (i % 4)
+				line = line[:i] + "    "[:numSpaces] + line[i+1:]
+				i += numSpaces - 1
+			}
+		}
+
 		n := 0
 		offset := 0
 		lastWhitespaceIndex := -1

pkg/utils/lines_test.go

@@ -334,6 +334,15 @@ func TestWrapViewLinesToWidth(t *testing.T) {
 				"drifting blah blah",
 			},
 		},
+		{
+			name:  "Tabs",
+			wrap:  true,
+			text:  "\ta\tbb\tccc\tdddd\teeeee",
+			width: 50,
+			expectedWrappedLines: []string{
+				"    a   bb  ccc dddd    eeeee",
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {