Add g:lsc_preview_split_direction config

Allows the preview window to be treated different than normal splits.

CHANGELOG.md

@@ -3,6 +3,8 @@
 - Bug Fix: Handle completion items with empty detail.
 - `LSClientShowHover` now reuses the window it already opened rather than
   closing it and splitting again to allow for maintaining layout.
+- Add optional configuration `g:lsc_preview_split_direction` to override
+  `splitbelow`.
 
 # 0.2.3
 

README.md

@@ -115,3 +115,5 @@ using the default mappings) to populate the quickfix list with usage locations.
 
 While the cursor is on any identifier call `LSClientShowHover` (`K` if using the
 default mappings) to request hover text and show it in a preview window.
+Override the direction of the split by setting `g:lsc_preview_split_direction`
+to either `'below'` or `'above'`.

autoload/lsc/util.vim

@@ -119,8 +119,12 @@ function! s:createOrJumpToPreview(line_count) abort
       execute 'resize '.want_height
     endif
   else
-    sp __lsc_preview__
-    execute 'resize '.want_height
+    if exists('g:lsc_preview_split_direction')
+      let direction = g:lsc_preview_split_direction
+    else
+      let direction = ''
+    endif
+    execute direction.' '.string(want_height).'split __lsc_preview__'
   endif
   set previewwindow
   set winfixheight