fix: handle tab on tmux next3.6

[ddzero2c]

merge this after tmux 3.6 released

[Copilot]

Pull Request Overview

This PR fixes tab handling in tmux-easymotion by updating the functions that compute character widths and true positions.

• Added a new helper function calculate_tab_width and updated get_char_width, get_string_width, and get_true_position to account for tab characters.
• Extended tests in test_easymotion.py to verify the updated handling of tabs.
• Updated documentation in CLAUDE.md to reflect recent changes.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
test_easymotion.py	New tests to verify tab width and true position with tab characters.
easymotion.py	Updated tab handling by refactoring character width, string width, and true position calculations; added calculate_tab_width.
CLAUDE.md	Updated documentation for project guidance.

Comments suppressed due to low confidence (1)

easymotion.py:562

• The visual position calculation code in the CASE_SENSITIVE and non-case-sensitive branches of find_matches is duplicated. Consider refactoring this logic into a separate helper function to reduce repetition and improve maintainability.

if CASE_SENSITIVE:

[Copilot]

[nitpick] It may be beneficial to update the docstring of get_char_width to explicitly mention how the position parameter affects tab width calculation and caching behavior.

Suggested change

	"""Get visual width of a single character with caching
	Args:
	char: The character to measure
	position: The visual position of the character (needed for tabs)
	"""Get visual width of a single character with caching.
	This function calculates the visual width of a character, taking into account
	special cases like tab characters and wide East Asian characters. The result
	is cached to improve performance for repeated calls with the same arguments.
	Args:
	char: The character to measure.
	position: The visual position of the character in the line. This is used
	to calculate the width of tab characters (`\t`) based on their position,
	as tab width depends on alignment. Different `position` values will
	result in different cache keys, which can affect performance and memory
	usage.
	Returns:
	The visual width of the character.