query window when shadow and blur effects enabled, extends outside of the window

[jjw24]

currently in dev branch as at commit 2e412a00232998546f987c034adc753c59c36b06, query window when blur enabled via the theme, extends outside of the window

repro:

1. enable shadow
2. switch to BlurBlack Darker theme
3. restart flow
4. the edges where there should be shadow becomes just blurred:
   

[jjw24]

similar thing happens with production release v1.7.2

this is the query window with BlurBlack Darker theme enabled with shadow:

[jjw24]

problem atm appears to be with blur not shadow

[jjw24]

so blur doesnt work with shadow effect because the code applies blur to the entire window, and when shadow is added, extra margin required by shadow creates some funkiness with the blur effect.

going to update the code to automatically switch off shadow when blur effect is applied by the theme.