TUI/paste: always flush on paste mode-change

Flush input before entering, not only when leaving, paste mode. Else
there could be pending input which will erroneously be sent to the paste
handler.

src/nvim/lua/vim.lua

@@ -96,17 +96,19 @@ end
 -- Default paste function.
 local function _paste(data)
   -- local eof = (data == {''})
-  local curline = vim.api.nvim_call_function('line', {'.'})
+  local curline = vim.api.nvim_call_function('line', {'.'}) - 1
   vim.api.nvim_buf_set_lines(
       0,
       curline,
       curline,
       false,
       data)
-  vim.api.nvim_call_function('cursor', {curline + #data, 1})
+  vim.api.nvim_call_function(
+      'cursor',
+      {curline + #data, 9999999})
+  -- TODO: do not redraw (slow!) until paste is finished.
   -- if eof then
-  --   vim.api.nvim_command('redraw')
+  vim.api.nvim_command('redraw')
-  -- end
   return 0
 end
 

src/nvim/tui/input.c

@@ -16,8 +16,6 @@
 #include "nvim/os/input.h"
 #include "nvim/event/rstream.h"
 
-#define PASTE_KEY "<Paste>"
-#define PASTEPOST_KEY "<PastePost>"
 #define KEY_BUFFER_SIZE 0xfff
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
@@ -401,9 +399,7 @@ static bool handle_bracketed_paste(TermInput *input)
       return true;
     }
 
-    if (!enable) {
+    tinput_flush(input, true);
-      tinput_flush(input, true);
-    }
     input->paste_enabled = enable;
     return true;
   }

test/functional/terminal/tui_spec.lua

@@ -146,10 +146,8 @@ describe('TUI', function()
     ]], attrs)
   end)
 
-  it('automatically sends <Paste> for bracketed paste sequences', function()
+  it('bracketed Paste', function()
     -- Pasting can be really slow in the TUI, specially in ASAN.
-    -- This will be fixed later but for now we require a high timeout.
-    screen.timeout = 60000
     feed_data('i\027[200~')
     screen:expect([[
       {1: }                                                 |
@@ -157,29 +155,30 @@ describe('TUI', function()
       {4:~                                                 }|
       {4:~                                                 }|
       {5:[No Name]                                         }|
-      {3:-- INSERT (paste) --}                              |
+      {3:-- INSERT --}                                      |
       {3:-- TERMINAL --}                                    |
     ]])
     feed_data('pasted from terminal')
     screen:expect([[
       pasted from terminal{1: }                             |
-      {4:~                                                 }|
+                                                        |
-      {4:~                                                 }|
-      {4:~                                                 }|
-      {5:[No Name] [+]                                     }|
-      {3:-- INSERT (paste) --}                              |
-      {3:-- TERMINAL --}                                    |
-    ]])
-    feed_data('\027[201~')
-    screen:expect([[
-      pasted from terminal{1: }                             |
-      {4:~                                                 }|
       {4:~                                                 }|
       {4:~                                                 }|
       {5:[No Name] [+]                                     }|
       {3:-- INSERT --}                                      |
       {3:-- TERMINAL --}                                    |
     ]])
+    feed_data('\027[201~')  -- End paste.
+    feed_data('\027\000')   -- ESC: go to Normal mode.
+    screen:expect([[
+      pasted from termina{1:l}                              |
+                                                        |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {5:[No Name] [+]                                     }|
+                                                        |
+      {3:-- TERMINAL --}                                    |
+    ]])
   end)
 
   it('handles pasting a specific amount of text', function()