Trim indent guides to stop at last non-empty line.

Adjust the end position of indent guides to prevent them from extending through empty space.

Author: ronharel02

crates/editor/src/indent_guides.rs

@@ -179,6 +179,19 @@ pub fn indent_guides_in_range(
                 line_indent.len(indent_guide.tab_size) <= indent_guide.indent_level();
             !(is_folded && contained_in_fold)
         })
+        .map(|mut indent_guide| {
+            // Adjust end_row of each guide to the last non-empty line.
+            while indent_guide.end_row.0 > indent_guide.start_row.0 {
+                let line_indent = snapshot
+                    .buffer_snapshot
+                    .line_indent_for_row(MultiBufferRow(indent_guide.end_row.0));
+                if !line_indent.is_line_empty() {
+                    break;
+                }
+                indent_guide.end_row.0 = indent_guide.end_row.0.saturating_sub(1);
+            }
+            indent_guide
+        })
         .collect()
 }