Incorrect display of math toolbars on secondary monitor

[Jin Cao]

Dear Lyx developers,

I hope this is the proper way to submit a bug report.

The math toolbar displays incorrectly on secondary monitors. To reproduce:
1. Open test.lyx of the attached file
2. Move the Lyx window to a secondary monitor
3. Edit an equation
4. Click the math toolbar
You may see the problem as shown in the attached screenshot.

Additional notes:
1. This issue exists in the current release (2.4.1) and previous
versions (e.g., 2.3.7)
2. The problem appears to be limited to secondary monitors
3. The toolbar displays correctly when clicked a second time

Best regards,
Jin Cao
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