Click-and-drag does not cause search field to lose focus

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### Windows Terminal version

1.20.11781.0

### Windows build number

10.0.19045.4529

### Other Software

_No response_

### Steps to reproduce

Settings:
- "Automatically copy selection to clipboard" (`copyOnSelect`): false
- "Automatically focus pane on mouse hover" (`focusFollowMouse`): false

Steps:
1. Echo some arbitrary text on the console
(not needed if for example PowerShell automatically printed its version; or the current working directory)
2. Open the search: Ctrl + Shift + F
3. Click-and-drag to select any of the output from step 1
ℹ️ Note: Do not perform a separate left click; instead press down the mouse button and directly start dragging your mouse
4. Try for example to copy the selection with Ctrl + C

### Expected Behavior

Step 3: The search text field lost focus; the console output got focus
Step 4: You copied your selection to the clipboard

### Actual Behavior

Step 3: A text selection is shown for the console output, _but_ the search text field still has focus
Step 4: You did not copy anything because the search text field still has focus

Side note: If instead of click-and-drag you perform a separate click (press and release) first, then the console output properly has focus.

Reproduce the issue in Windows Terminal with copyOnSelect and focusFollowMouse disabled, using the listed click-and-drag steps. Then trace the mouse-drag and focus handling for the search field and console output. Done means dragging directly transfers focus so Ctrl+C copies the selected console text.

Written by the indexing model from the issue text.