Change the colour of filter field backgroud when a filter is set
The user may pass over a set filter. Especially when some blank characters are entered. This may create confusion especially when no messages are displayed as a result of such filter.
The filter box background should be highlighted when a filter is entered. Preferred behaviour would be:
- pale green - when a filter is set and applied with a positive result
- pale red - when a filter is set and applied with a negative result
- white - when no filter is set
[datovka #634573]:
- Mel jsem zadane vyhledavani vpravo nahore, z hledani v jine schrance, a tim se mi po prechodu do jine schranky nezobrazila zprava, ktera parametru neodpovidala - takze to vypadalo, jako by tam zadne zpravy nebyly.