Assistants - Track - Adaptive - Insert Track (folder aware)

Behaves like REAPER's own "Insert new track", but when you insert after the last track inside a Folder, the new track stays inside the Folder instead of being pushed outside.

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Why this exists

REAPER's native Track: Insert new track has this behavior:

▼ My Folder
 Track A
 Track B ← last selected track in the Folder
Press the new-track shortcut

▼ My Folder
 Track A
 Track B
New Track ← ⚠️ ends up outside the Folder!

This Action fixes that scenario — the new track stays inside the Folder and naturally becomes its new last child:

▼ My Folder
 Track A
 Track B
 New Track ← still inside the Folder

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Behavior details

• If the Last Touched track is not the last track in a Folder → uses REAPER's native Insert behavior, exactly like the stock action.
• If it is the last track in a Folder → uses special insertion logic so the new track takes over the Folder close point, and the previous last track becomes the second-to-last.
• If there is no Last Touched track → also uses native Insert behavior.
• After the operation, the new track is selected, matching native behavior.