unicode: change cell to wide when grapheme width changes

src/unicode/props.zig

@@ -13,6 +13,10 @@ pub const Properties = packed struct {
     /// becomes a 2-em dash).
     width: u2 = 0,
 
+    /// Whether the code point does not contribute to the width of a grapheme
+    /// cluster (not used for single code point cells).
+    width_zero_in_grapheme: bool = false,
+
     /// Grapheme break property.
     grapheme_break: uucode.x.types.GraphemeBreakNoControl = .other,
 
@@ -23,6 +27,7 @@ pub const Properties = packed struct {
     // Needed for lut.Generator
     pub fn eql(a: Properties, b: Properties) bool {
         return a.width == b.width and
+            a.width_zero_in_grapheme == b.width_zero_in_grapheme and
             a.grapheme_break == b.grapheme_break and
             a.emoji_vs_text == b.emoji_vs_text and
             a.emoji_vs_emoji == b.emoji_vs_emoji;
@@ -36,12 +41,14 @@ pub const Properties = packed struct {
         try writer.print(
             \\.{{
             \\    .width= {},
+            \\    .width_zero_in_grapheme= {},
             \\    .grapheme_break= .{s},
             \\    .emoji_vs_text= {},
             \\    .emoji_vs_emoji= {},
             \\}}
         , .{
             self.width,
+            self.width_zero_in_grapheme,
             @tagName(self.grapheme_break),
             self.emoji_vs_text,
             self.emoji_vs_emoji,

src/unicode/props_uucode.zig

@@ -8,6 +8,7 @@ const Properties = @import("props.zig").Properties;
 pub fn get(cp: u21) Properties {
     if (cp > uucode.config.max_code_point) return .{
         .width = 1,
+        .width_zero_in_grapheme = true,
         .grapheme_break = .other,
         .emoji_vs_text = false,
         .emoji_vs_emoji = false,
@@ -15,6 +16,7 @@ pub fn get(cp: u21) Properties {
 
     return .{
         .width = uucode.get(.width, cp),
+        .width_zero_in_grapheme = uucode.get(.wcwidth_zero_in_grapheme, cp),
         .grapheme_break = uucode.get(.grapheme_break_no_control, cp),
         .emoji_vs_text = uucode.get(.is_emoji_vs_text, cp),
         .emoji_vs_emoji = uucode.get(.is_emoji_vs_emoji, cp),