It is not possible to select multiple layers in the Layers window using the Shift/Ctrl keys

[PakIvan]

1. Summary: It is not possible to select multiple layers in the Layers window using the Shift/Ctrl keys 2. Steps to reproduce:

• Create new layers
• Select layer
• Hold down the Shift/Ctrl keys
• Select other layer

3. Expected result: Multiple layers are highlighted 4. Actual result: One layer is highlighted 5. Environment: Windows 8.1 6. Version: LazPaint 7.1.6 (64-bit) 7. Severity: Minor

[circular17]

Related to https://github.com/bgrabitmap/lazpaint/issues/68