ghcide: Pass -fmax-valid-hole-fits=10 to GHC

In cases where GHC doesn't know anything about the type of a hole, it suggests
every available symbol as a hole fit, which can cause editors to crash or at
least be very slow. 10 seems to be a fair number to limit hole fits to.

Author: akshaymankar

ghcide/src/Development/IDE/GHC/Compat.hs

@@ -434,7 +434,7 @@ setHieDir _f d = d { hieDir = Just _f}
 dontWriteHieFiles :: DynFlags -> DynFlags
 dontWriteHieFiles d = gopt_unset d Opt_WriteHie
 
-setUpTypedHoles ::DynFlags -> DynFlags
+setUpTypedHoles :: DynFlags -> DynFlags
 setUpTypedHoles df
   = flip gopt_unset Opt_AbstractRefHoleFits    -- too spammy
   $ flip gopt_unset Opt_ShowDocsOfHoleFits     -- not used
@@ -449,7 +449,7 @@ setUpTypedHoles df
   $ df
   { refLevelHoleFits = Just 1   -- becomes slow at higher levels
   , maxRefHoleFits   = Just 10  -- quantity does not impact speed
-  , maxValidHoleFits = Nothing  -- quantity does not impact speed
+  , maxValidHoleFits = Just 10  -- quantity does not impact speed
   }