feat(treesitter): enabled by default for all pickers

Only pickers that support treesitter (i.e. display code lines)
are enabled, disable globally by setting `winopts.treesitter`:
```lua
:lua require("fzf-lua").setup({winopts={treesitter=false}})
```

README.md

@@ -420,7 +420,7 @@ winopts = {
     -- due to highlight color collisions will also override `fzf_colors`
     -- set `fzf_colors=false` or `fzf_colors.hl=...` to override
     treesitter       = {
-      enabled    = false,
+      enabled    = true,
       fzf_colors = { ["hl"] = "-1:reverse", ["hl+"] = "-1:reverse" }
     },
     preview = {

lua/fzf-lua/defaults.lua

@@ -54,7 +54,7 @@ M.defaults                      = {
     fullscreen = false,
     title_pos  = "center",
     treesitter = {
-      enabled    = false,
+      enabled    = true,
       fzf_colors = { ["hl"] = "-1:reverse", ["hl+"] = "-1:reverse" }
     },
     preview    = {
@@ -435,7 +435,6 @@ M.defaults.git                  = {
       ["ctrl-t"] = actions.git_buf_tabedit,
       ["ctrl-y"] = { fn = actions.git_yank_commit, exec_silent = true },
     },
-    winopts       = { treesitter = true },
     fzf_opts      = { ["--no-multi"] = true },
     _multiline    = false,
     -- `winopts.treesitter==true` line match format
@@ -565,9 +564,9 @@ M.defaults.quickfix             = {
   file_icons  = 1,
   color_icons = true,
   git_icons   = false,
+  only_valid  = false,
   fzf_opts    = { ["--multi"] = true },
   _actions    = function() return M.globals.actions.files end,
-  only_valid  = false,
   _treesitter = true,
   _cached_hls = { "path_colnr", "path_linenr" },
 }
@@ -587,9 +586,9 @@ M.defaults.loclist              = {
   file_icons  = 1,
   color_icons = true,
   git_icons   = false,
+  only_valid  = false,
   fzf_opts    = { ["--multi"] = true },
   _actions    = function() return M.globals.actions.files end,
-  only_valid  = false,
   _treesitter = true,
   _cached_hls = { "path_colnr", "path_linenr" },
 }
@@ -654,7 +653,6 @@ M.defaults.lines                = {
   show_unlisted    = false,
   no_term_buffers  = true,
   sort_lastused    = true,
-  winopts          = { treesitter = true },
   fzf_opts         = {
     ["--multi"]     = true,
     ["--delimiter"] = "[\t]",

lua/fzf-lua/profiles/ivy.lua

@@ -1,4 +1,4 @@
-local M  = {
+local M       = {
   { "default-title" }, -- base profile
   desc = "UI at the bottom of the screen",
   winopts = {
@@ -40,22 +40,22 @@ local M  = {
   },
 }
 
-M.blines = {
-  winopts = {
-    row = 1,
-    col = 0,
-    width = 1,
-    height = 1,
-    preview = {
-      layout = "vertical",
-      vertical = "up:60%",
-      border = "none",
-    },
+local up      = {
+  row = 1,
+  col = 0,
+  width = 1,
+  height = 1,
+  preview = {
+    layout = "vertical",
+    vertical = "up:60%",
+    border = "none",
   },
-  previewer = { toggle_behavior = "extend" },
 }
 
-M.lines  = M.blines
-M.grep   = M.blines
+M.blines      = { winopts = up, previewer = { toggle_behavior = "extend" } }
+M.lines       = M.blines
+M.grep        = M.blines
+M.grep_curbuf = M.blines
+M.git         = { blame = { winopts = up } }
 
 return M

lua/fzf-lua/win.lua

@@ -857,6 +857,7 @@ function FzfWin:treesitter_attach()
         local min, max, tr = 0, nil, 4
         if not self.preview_hidden
             and (not self.previewer_is_builtin or self.winopts.split)
+            and vim.api.nvim_win_is_valid(self.fzf_winid)
         then
           local win_width = vim.api.nvim_win_get_width(self.fzf_winid)
           local layout = self:fzf_preview_layout_str()