fix(tui): grow termkey's internal buffer for large escape sequences (#26309)

Some escape sequences (in particular, OSC 52 paste responses) can be
very large, even unbounded in length. These can easily overflow
termkey's internal buffer. In order to process these long sequences,
dynamically grow termkey's internal buffer.

1 files changed, 25 insertions, 0 deletions

diff --git a/test/functional/terminal/tui_spec.lua b/test/functional/terminal/tui_spec.lua
index b17eed00f9..96ae0c4662 100644
--- a/test/functional/terminal/tui_spec.lua
+++ b/test/functional/terminal/tui_spec.lua
@@ -2557,6 +2557,31 @@ describe("TUI", function()
     end)
   end)
 
+  it('does not crash on large inputs #26099', function()
+    nvim_tui()
+
+    screen:expect([[
+      {1: }                                                 |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+                                                        |
+      {3:-- TERMINAL --}                                    |
+    ]])
+
+    feed_data(string.format('\027]52;c;%s\027\\', string.rep('A', 8192)))
+
+    screen:expect{grid=[[
+      {1: }                                                 |
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+      {4:~                                                 }|
+                                                        |
+      {3:-- TERMINAL --}                                    |
+    ]], unchanged=true}
+  end)
 end)
 
 -- See test/unit/tui_spec.lua for unit tests.