Show file preview in split pane in fuzzy finder (#534)

* Add preview pane for fuzzy finder

* Fix picker preview lag by caching

* Add picker preview for document symbols

* Cache picker preview per document instead of view

* Use line instead of range for preview doc

* Add picker preview for buffer picker

* Fix render bug and refactor picker

* Refactor picker preview rendering

* Split picker and preview and compose

The current selected item is cloned on every event, which is
undesirable

* Refactor out clones in previewed picker

* Retrieve doc from editor if possible in filepicker

* Disable syntax highlight for picker preview

Files already loaded in memory have syntax highlighting enabled

* Ignore directory symlinks in file picker

* Cleanup unnecessary pubs and derives

* Remove unnecessary highlight from file picker

* Reorganize buffer rendering

* Use normal picker for code actions

* Remove unnecessary generics and trait impls

* Remove prepare_for_render and make render mutable

* Skip picker preview if screen small, less padding

1 files changed, 1 insertions, 1 deletions

diff --git a/helix-term/src/ui/markdown.rs b/helix-term/src/ui/markdown.rs
index 6c79ca67..b7e29f21 100644
--- a/helix-term/src/ui/markdown.rs
+++ b/helix-term/src/ui/markdown.rs
@@ -198,7 +198,7 @@ fn parse<'a>(
     Text::from(lines)
 }
 impl Component for Markdown {
-    fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
+    fn render(&mut self, area: Rect, surface: &mut Surface, cx: &mut Context) {
         use tui::widgets::{Paragraph, Widget, Wrap};
 
         let text = parse(&self.contents, Some(&cx.editor.theme), &self.config_loader);