fix: #627

Author: phanen

lua/treesitter-context/context.lua

@@ -168,6 +168,9 @@ local function trim_contexts(context_ranges, context_lines, trim, top)
   while trim > 0 do
     local idx = top and 1 or #context_ranges
     local context_to_trim = context_ranges[idx]
+    if not context_to_trim then
+      return
+    end
 
     local height = util.get_range_height(context_to_trim)
 

test/ts_context_spec.lua

@@ -105,6 +105,15 @@ describe('ts_context', function()
     })
   end)
 
+  it('#627', function()
+    exec_lua(install_langs, { 'vimdoc' })
+    exec_lua(tc_helpers.setup, { multiwindow = true })
+    cmd('edit test/snapshots/snapshot.md')
+    cmd('set splitkeep=screen')
+    cmd('help')
+    cmd('sleep 100m')
+  end)
+
   describe('language:', function()
     before_each(function()
       exec_lua(tc_helpers.setup, {