BugFix(clipboard): Fix block paste not working properly

Block copy and paste from system-clipboard currently breaks formatting.
This fixes it.

The bug occurs because system-clipboard doesn't contain information
about what mode the copy was made.
Simple solution to this is we keep a cache of copy we last made along
with mode information. If system-clipboard returns the cache we apply
the mode information that we know about that cache.

1 files changed, 11 insertions, 1 deletions

diff --git a/runtime/autoload/provider/clipboard.vim b/runtime/autoload/provider/clipboard.vim
index 07f37d604f..dea79f21f0 100644
--- a/runtime/autoload/provider/clipboard.vim
+++ b/runtime/autoload/provider/clipboard.vim
@@ -156,7 +156,14 @@ function! s:clipboard.get(reg) abort
   elseif s:selections[a:reg].owner > 0
     return s:selections[a:reg].data
   end
-  return s:try_cmd(s:paste[a:reg])
+
+  let clipboard_data = s:try_cmd(s:paste[a:reg])
+  if match(&clipboard, '\v(unnamed|unnamedplus)') >= 0 && get(s:selections[a:reg].data, 0, []) == clipboard_data
+    " When system clipboard return is same as our cache return the cache
+    " as it contains regtype information
+    return s:selections[a:reg].data
+  end
+  return clipboard_data
 endfunction
 
 function! s:clipboard.set(lines, regtype, reg) abort
@@ -175,6 +182,9 @@ function! s:clipboard.set(lines, regtype, reg) abort
 
   if s:cache_enabled == 0
     call s:try_cmd(s:copy[a:reg], a:lines)
+    "Cache it anyway we can compare it later to get regtype of the yank
+    let s:selections[a:reg] = copy(s:selection)
+    let s:selections[a:reg].data = [a:lines, a:regtype]
     return 0
   end