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This hides implicits conversions (and potential members obtained through
it) that converts a type into itself, because these conversions are
usually non-sensical. They are not completely removed, just placed behind
`-doc-implicits-show-all`, like other implicits deemed probably useless.
---
Consider the scaladoc for the following class:
```
object Box {
implicit def anyToBox[T](t: T): Box[T] = new Box(t)
}
class Box[T](val t: T)
```
When looking for implicits members to add to class `Box`, it finds the
implicit conversion `anyToBox`, and applies it to itself to have an
implicit conversion to Box[Box[T]], which brings a useless implicit
member `t: Box[T]`.
This commit makes scaladoc ignore any conversion from a type to itself
(even if type parameters differ) by default.
Using the (very useful) `tools/scaladoc-diff` script, I found that this
change removes the following conversion from the library doc:
```
Ensuring[A] to Ensuring[Ensuring[A]]
anytostringadd[A] to any2stringadd[anytostringadd[A]]
ArrowAssoc[A] to ArrowAssoc[ArrowAssoc[A]]
=:=[From,To] to =:=[From,To]
SearchImpl[A,Repr] to SearchImpl[A,SearchImpl[A,Repr]]
CollectionsHaveToParArray[C, T] to CollectionsHaveToParArray[CollectionsHaveToParArray[C, T], T]
Ordered[A] to Ordered[Ordered[A]]
StringFormat[A] to StringFormat[StringFormat[A]]
```
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