FIX: Pinned platform specific versions of pyqt6 & pyqt6-qt6.

[darikoneil]

Qt 6.5 introduced breaking changes to dependencies that the distribution of pyqt6 does not properly handle for linux platforms. These breaking changes can result in a variety of strange errors during runtime due to missing or failing to load linked-libraries (e.g., xcb-cursor0). Users can "fix" these errors by manually installing non-python libraries (e.g., sudo apt install), so they may not appear to be related or reported. Feel free to just close this and add the constraints yourself if it's easier (it's only 3 lines).

P.S.: In troubleshooting this for some colleagues, I came across some issues that might also be related to this in other MouseLand repo's (e.g., Kilosort #1001 and Cellpose #926).

[Copilot]

Pull request overview

This PR addresses PyQt6 compatibility issues on Linux by pinning PyQt6 and PyQt6-Qt6 versions to <6.5 for Linux platforms, while allowing unrestricted versions for non-Linux platforms. Qt 6.5 introduced breaking changes that cause runtime errors on Linux due to missing or failing linked-libraries.

Key Changes

• Replaces the unconditional pyqt6 dependency with platform-specific versions
• Pins pyqt6<6.5 and pyqt6-qt6<6.5 for Linux platforms only
• Allows unrestricted pyqt6 for non-Linux platforms

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[Copilot]

Inconsistent quote style: lines 19-21 use single quotes while line 22 uses double quotes. For consistency with the rest of the gui_deps list, these should use double quotes.

Suggested change

	'pyqt6 ; platform_system != "Linux"',
	'pyqt6<6.5 ; platform_system == "Linux"',
	'pyqt6-qt6<6.5 ; platform_system == "Linux"',
	"pyqt6 ; platform_system != \"Linux\"",
	"pyqt6<6.5 ; platform_system == \"Linux\"",
	"pyqt6-qt6<6.5 ; platform_system == \"Linux\"",

[Copilot]

The logic at lines 51-52, 58-59, and 65-66 that removes "pyqt6" from gui_deps will fail because "pyqt6" is no longer a simple string in the list. It has been replaced with conditional strings that include platform markers. This will cause the removal attempts to fail silently, which means PyQt5/PySide2/PySide6 installations will not prevent PyQt6 from being installed as intended. Consider updating the removal logic to handle the new conditional dependency strings, or refactor to check for existing Qt installations before defining gui_deps.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.89%. Comparing base (be8830d) to head (98ac444).
⚠️ Report is 222 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1203      +/-   ##
==========================================
- Coverage   55.21%   54.89%   -0.32%     
==========================================
  Files          43       43              
  Lines        5055     5064       +9     
==========================================
- Hits         2791     2780      -11     
- Misses       2264     2284      +20     

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