christophevg / clitic / 24857942810

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fix(diff): resolve visual artifacts from Strip cell_length cache mismatch

DiffPlugin.render_to_strips() was passing width as cached cell_length to
Strip(), but segments didn't always total width cells (padding was omitted
when text exactly filled the line). This caused crop_extend() to make wrong
decisions during resize, producing visual artifacts.

Fix: Always include padding segments and pass None for cell_length so
Textual calculates from actual segments.

Also added comprehensive rendering architecture documentation.

🤖 Implemented together with a coding agent.

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