Loop region reacts to mouse movements without pressing the mouse button

### Bug description

In certain situation (not yet know) the loop region area reacts to mouse movements even if the mouse button is not pressed when hovering over

### Steps to reproduce

1. Enable the loop region
2. ???
3. Disable the loop region
4. Move the mouse over it
5. Observe the loop region is auto-enabled

### Expected behavior

The loop region should be disabled

### Actual behavior

-

### Audacity Version

master

### Operating system

Windows

### Additional context

_No response_

No source file, test, or entry point is named. Start by reproducing the behavior on Windows with the master version, following the listed loop-region and mouse-hover steps; clarify the missing reproduction step and define completion as keeping the loop region disabled until the mouse button is pressed.

Written by the indexing model from the issue text.