Fix highlighting in picker with multiple columns (#6333)

helix-term/src/ui/picker.rs

@@ -812,7 +812,10 @@ fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
                 for cell in row.cells.iter_mut() {
                     let spans = match cell.content.lines.get(0) {
                         Some(s) => s,
-                        None => continue,
+                        None => {
+                            cell_start_byte_offset += TEMP_CELL_SEP.len();
+                            continue;
+                        }
                     };
 
                     let mut cell_len = 0;

helix-tui/src/text.rs

@@ -453,10 +453,12 @@ fn from(text: &Text<'a>) -> String {
         let mut output = String::with_capacity(size);
 
         for spans in &text.lines {
+            if !output.is_empty() {
+                output.push('\n');
+            }
             for span in &spans.0 {
                 output.push_str(&span.content);
             }
-            output.push('\n');
         }
         output
     }