End of visual selection is not visible if it occurs in a highlighted search result

[bcc32]

To reproduce

1. Ensure evil-search-module is customized to evil-search

2. Create a new buffer with the following contents:

   foo
   bar
   baz
   

3. / b a r RET (now bar is highlighted)

4. l v g g 0 (select from beginning of buffer through a in bar)

Screenshots

Notice that it is impossible to determine where the visual selection ends, because it is inside a highlighted search result.

In Vim, the visual selection's highlighting overrides the search result, so you can see the whole extent of the selection.

[bcc32]

BTW it seems that this is probably just a consequence of overlay priorities for evil-ex-search-overlay and evil-ex-substitute-overlay being very high (1000) while evil-visual-overlay's priority is only 99. Presumably the search overlay priorities should be much lower.