Chrome Version: 54.0.2804.0

chrome.tabs.move() accepts a list of tabIds. This is implemented by iterating over a list of tab IDs and then moving all tabs to a specified index, and after every iteration this index is incremented [1].
That logic makes sense for tabs within a single window, but is flawed when the list of tab IDs refer to tabs in multiple windows.

To reproduce,
1. Load the attached extension.
2. Open two new tabs and example.com after that.
3. Open a new window, with two new tabs and example.com after that.
4. Click on the extension button, which basically runs
   chrome.tabs.move([tabIdFromWindow1, tabIdFromWindow2], {index: 0});

Expected:
- Either all selected tabs are moved to the first place in their originating window.
- Or all selected tabs are moved to the first place in the first matching window.

Actual:
- The tabs appear to be moved to an arbitrary position, using the logic that I described at the top of this report (see [1]).


[1] https://chromium.googlesource.com/chromium/src/+/165732a4b1dec1676bf479f2fed9a8df2a73316f/chrome/browser/extensions/api/tabs/tabs_api.cc#1499


 

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