Wrong tooltip when split mode is used

Sometimes it's possible to have the wrong tooltip when split mode is used.

Steps:

1. Split editor
2. Hover mouse over some symbol in the left editor
3. Hover mouse over some symbol in the right editor
4. Hover mouse the same symbol in the left editor as in step #2

Actual result:

A tooltip will appear with text from the right editor.

Expected result:

A tooltip will appear with text from the left editor.