Change color of Search again button when inputs change

[roed314]

Fixes #5003.

[JohnCremona]

It certainly works, but the change is quite subtle. Does it have to be another shade of blue? Would something more eye-catching like flashing text be too much?!

[roed314]

I don't know what you mean by flashing text; something like this seems unwise to me.

I tried using a grey background (using color.button_background_inactive) rather than the light blue, but I didn't think that was appropriate since the button is still functional. Besides, I prefer having the difference be subtle, since I don't want it to be jarring for users.

[JohnCremona]

Fair enough -- I wasn't being serious about blinking. Thanks for implementing this!

[roed314]

Ah, I couldn't tell if you were joking or if there was some different way to interpret the suggestion. 😄