feat(redraw): use `:FzfLua redraw` when term size changes (#498)

doc/fzf-lua.txt

@@ -624,7 +624,7 @@ open an issue and I'll be more than happy to help.**
           color_icons   = true,
           previewer     = "git_diff",
           -- uncomment if you wish to use git-delta as pager
-          --preview_pager = "delta --width=$FZF_PREVIEW_COLUMNS"
+          --preview_pager = "delta --width=$FZF_PREVIEW_COLUMNS",
           actions = {
             -- actions inherit from 'actions.files' and merge
             ["right"]   = { actions.git_unstage, actions.resume },
@@ -636,7 +636,7 @@ open an issue and I'll be more than happy to help.**
           cmd           = "git log --color --pretty=format:'%C(yellow)%h%Creset %Cgreen(%><(12)%cr%><|(12))%Creset %s %C(blue)<%an>%Creset'",
           preview       = "git show --pretty='%Cred%H%n%Cblue%an <%ae>%n%C(yellow)%cD%n%Cgreen%s' --color {1}",
           -- uncomment if you wish to use git-delta as pager
-          --preview_pager = "delta --width=$FZF_PREVIEW_COLUMNS"
+          --preview_pager = "delta --width=$FZF_PREVIEW_COLUMNS",
           actions = {
             ["default"] = actions.git_checkout,
           },
@@ -651,7 +651,7 @@ open an issue and I'll be more than happy to help.**
           cmd           = "git log --color --pretty=format:'%C(yellow)%h%Creset %Cgreen(%><(12)%cr%><|(12))%Creset %s %C(blue)<%an>%Creset' <file>",
           preview       = "git diff --color {1}~1 {1} -- <file>",
           -- uncomment if you wish to use git-delta as pager
-          --preview_pager = "delta --width=$FZF_PREVIEW_COLUMNS"
+          --preview_pager = "delta --width=$FZF_PREVIEW_COLUMNS",
           actions = {
             ["default"] = actions.git_buf_edit,
             ["ctrl-s"]  = actions.git_buf_split,
@@ -1010,4 +1010,4 @@ I missed your name feel free to contact me and I'll add it below:
   as baseline for the builtin previewer and his must have plugin nvim-bqf
   <https://github.com/kevinhwang91/nvim-bqf>
 
-vim:tw=78:ts=8:ft=help:norl:
+vim:tw=78:ts=8:ft=help:norl:

lua/fzf-lua/init.lua

@@ -208,6 +208,13 @@ M.fzf_exec = require'fzf-lua.core'.fzf_exec
 M.fzf_live = require'fzf-lua.core'.fzf_live
 M.defaults = config.globals
 
+M.redraw = function()
+  local winobj = require'fzf-lua'.win.__SELF()
+  if winobj then
+    winobj:redraw()
+  end
+end
+
 -- exported modules
 M._exported_modules = {
   'win',

lua/fzf-lua/win.lua

@@ -364,6 +364,7 @@ function FzfWin:new(o)
     return _self
   end
   o = o or {}
+  self._o = o
   self = setmetatable({}, { __index = self })
   self.actions = o.actions
   self.winopts = normalize_winopts(o)
@@ -605,6 +606,19 @@ function FzfWin:fs_fzf_layout(fs, winopts)
 end
 
 function FzfWin:redraw()
+  self.winopts = normalize_winopts(self._o)
+  if not self.winopts.split and self.previewer_is_builtin then
+    self.layout = self:generate_layout(self.winopts)
+  end
+  if self:validate() then
+    self:redraw_main()
+  end
+  if self:validate_preview() then
+    self:redraw_preview()
+  end
+end
+
+function FzfWin:redraw_main()
     if self.winopts.split then return end
     local hidden = self._previewer and self.preview_hidden
     local relative = self.winopts.relative or 'editor'
@@ -754,7 +768,7 @@ function FzfWin:create()
     self:set_style_minimal(self.fzf_winid)
   else
     -- draw the main window
-    self:redraw()
+    self:redraw_main()
   end
 
   -- verify the preview is closed, this can happen
@@ -1056,7 +1070,7 @@ function FzfWin.toggle_fullscreen()
   self.fullscreen = not self.fullscreen
   self:hide_scrollbar()
   if self and self:validate() then
-    self:redraw()
+    self:redraw_main()
   end
   if self and self:validate_preview() then
     self:redraw_preview()
@@ -1072,9 +1086,9 @@ function FzfWin.toggle_preview()
   end
   if self.preview_hidden and self:validate_preview() then
     self:close_preview()
-    self:redraw()
+    self:redraw_main()
   elseif not self.preview_hidden then
-    self:redraw()
+    self:redraw_main()
     self:redraw_preview()
     if self._previewer and self._previewer.display_last_entry then
       self._previewer:display_last_entry()
@@ -1117,7 +1131,7 @@ function FzfWin.toggle_preview_cw(direction)
   self.winopts.preview_pos = pos[newidx]
   self.layout = self:generate_layout(self.winopts)
   self:close_preview()
-  self:redraw()
+  self:redraw_main()
   self:redraw_preview()
   if self._previewer and self._previewer.display_last_entry then
     self._previewer:display_last_entry()