Improve Diffs view for subagents working in different worktrees

[exedev-shelley]

Author: realami
Channel: #feedback
Link: https://discord.com/channels/1405685085923049482/1405686161791516873/1472290021447831687

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Feedback

Three-dot menu Diffs feedback from working with subagents in different worktrees:

1. Add branch/commitish selection level: IWBN to have another (higher) level of the "Choose base..." / "Choose file..." hierarchy to "Choose branch/commitish..." from which to pull diffs.

2. Fix Diffs view context for subagents: The Diffs view seems pinned to the working directory of the parent chat, even if subagents are working in different worktrees. IWBN if the Diffs view triggered when a subagent convo is selected would default to the folder where that subagent is working.

Context

This feedback came from practical experience working with multiple subagents operating in different worktrees simultaneously.