Tab key now has indent-aware behavior (MC parity):
- When cursor is in the indent zone (only whitespace before it on
the current line), Tab inserts enough spaces to advance to the
next tab_width boundary.
- When cursor is past any non-whitespace, Tab inserts a single
literal '\t' character for column alignment.
New methods on Editor (editor/mod.rs):
insert_tab_with_indent()
- Computes next_boundary = ((col / tab_width) + 1) * tab_width
- In indent zone: inserts (next_boundary - col) spaces
- Otherwise: inserts literal '\t'
is_in_indent_zone() -> bool
- True if all bytes between line start and cursor are space/tab
Tab handler in editor/handlers.rs routes through
insert_tab_with_indent() instead of insert_char('\t').
Tests (6 new in editor::tests):
- tab_at_col_0_indents_to_next_boundary
- tab_at_col_4_indents_to_next_boundary
- tab_mid_line_inserts_literal_tab
- tab_after_non_whitespace_inserts_literal_tab
- tab_after_whitespace_runs_continues_indent
- tab_inside_word_inserts_literal_tab
Total: 1248 passing (was 1242; +6 new).
kellito
2633c40dfd