Updated plugins. Fixed some issues related to empty space and peaksea. Using Source Code Pro as default font

sources_non_forked/vim-airline/autoload/airline/extensions/tabline.vim

@@ -5,6 +5,7 @@ let s:formatter = get(g:, 'airline#extensions#tabline#formatter', 'default')
 let s:excludes = get(g:, 'airline#extensions#tabline#excludes', [])
 let s:tab_nr_type = get(g:, 'airline#extensions#tabline#tab_nr_type', 0)
 let s:show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
+let s:show_tab_nr = get(g:, 'airline#extensions#tabline#show_tab_nr', 1)
 
 let s:builder_context = {
       \ 'active'        : 1,
@@ -103,7 +104,7 @@ function! airline#extensions#tabline#title(n)
 endfunction
 
 function! airline#extensions#tabline#get_buffer_name(nr)
-  return airline#extensions#tabline#formatters#{s:formatter}(a:nr, get(s:, 'current_buffer_list', []))
+  return airline#extensions#tabline#{s:formatter}#format(a:nr, get(s:, 'current_buffer_list', s:get_buffer_list()))
 endfunction
 
 function! s:get_buffer_list()
@@ -179,9 +180,16 @@ function! s:get_visible_buffers()
   return buffers
 endfunction
 
+let s:current_bufnr = -1
+let s:current_tabnr = -1
+let s:current_tabline = ''
 function! s:get_buffers()
-  let b = airline#builder#new(s:builder_context)
   let cur = bufnr('%')
+  if cur == s:current_bufnr
+    return s:current_tabline
+  endif
+
+  let b = airline#builder#new(s:builder_context)
   let tab_bufs = tabpagebuflist(tabpagenr())
   for nr in s:get_visible_buffers()
     if nr < 0
@@ -207,13 +215,22 @@ function! s:get_buffers()
   call b.add_section('airline_tabfill', '')
   call b.split()
   call b.add_section('airline_tabtype', ' buffers ')
-  return b.build()
+
+  let s:current_bufnr = cur
+  let s:current_tabline = b.build()
+  return s:current_tabline
 endfunction
 
 function! s:get_tabs()
+  let curbuf = bufnr('%')
+  let curtab = tabpagenr()
+  if curbuf == s:current_bufnr && curtab == s:current_tabnr
+    return s:current_tabline
+  endif
+
   let b = airline#builder#new(s:builder_context)
   for i in range(1, tabpagenr('$'))
-    if i == tabpagenr()
+    if i == curtab
       let group = 'airline_tabsel'
       if g:airline_detect_modified
         for bi in tabpagebuflist(i)
@@ -226,18 +243,24 @@ function! s:get_tabs()
       let group = 'airline_tab'
     endif
     let val = '%('
-    if s:tab_nr_type == 0
-      let val .= ' %{len(tabpagebuflist('.i.'))}'
-    else
-      let val .= (g:airline_symbols.space).i
+    if s:show_tab_nr
+      if s:tab_nr_type == 0
+        let val .= ' %{len(tabpagebuflist('.i.'))}'
+      else
+        let val .= (g:airline_symbols.space).i
+      endif
     endif
     call b.add_section(group, val.'%'.i.'T %{airline#extensions#tabline#title('.i.')} %)')
   endfor
+
   call b.add_raw('%T')
   call b.add_section('airline_tabfill', '')
   call b.split()
   call b.add_section('airline_tab', ' %999XX ')
   call b.add_section('airline_tabtype', ' tabs ')
-  return b.build()
-endfunction
 
+  let s:current_bufnr = curbuf
+  let s:current_tabnr = curtab
+  let s:current_tabline = b.build()
+  return s:current_tabline
+endfunction