fix(context): keep context state and send behavior in sync

Author: disrupted

README.md

@@ -728,6 +728,13 @@ You can quiclkly see the current context items in the context bar at the top of
   <img src="https://i.imgur.com/vGgu6br.png" alt="Opencode.nvim context bar" width="90%" />
 </div>
 
+For `Current file`, the color indicates whether it will be sent with the next prompt:
+
+- Regular highlight: file is pending and will be included.
+- Dimmed/gray highlight: file was already sent and has not changed, so it will be skipped (delta behavior).
+
+If the file content changes, it becomes pending again and will be sent on the next prompt.
+
 ### Context Items Completion
 
 You can quickly reference available context items by typing `#` in the input window. This will show a completion menu with all available context items:

lua/opencode/context.lua

@@ -161,8 +161,7 @@ function M.clear_subagents()
 end
 
 function M.unload_attachments()
-  ChatContext.clear_files()
-  ChatContext.clear_selections()
+  ChatContext.unload_attachments()
 end
 
 function M.load()

lua/opencode/context/chat_context.lua

@@ -195,6 +195,7 @@ end
 
 function M.clear_selections()
   M.context.selections = {}
+  state.context_updated_at = vim.uv.now()
 end
 
 function M.add_file(file)
@@ -230,6 +231,7 @@ end
 
 function M.clear_files()
   M.context.mentioned_files = {}
+  state.context_updated_at = vim.uv.now()
 end
 
 function M.add_subagent(subagent)
@@ -261,11 +263,13 @@ end
 
 function M.clear_subagents()
   M.context.mentioned_subagents = {}
+  state.context_updated_at = vim.uv.now()
 end
 
 function M.unload_attachments()
   M.context.mentioned_files = {}
   M.context.selections = {}
+  state.context_updated_at = vim.uv.now()
 end
 
 function M.get_mentioned_files()
@@ -336,7 +340,7 @@ function M.should_update_current_file(current_file)
   end
 
   if not current_file then
-    return false, false
+    return true, false
   end
 
   -- Different file name means update needed
@@ -373,6 +377,10 @@ function M.load()
     return
   end
 
+  local prev_current_file = vim.deepcopy(M.context.current_file)
+  local prev_cursor_data = vim.deepcopy(M.context.cursor_data)
+  local prev_linter_errors = vim.deepcopy(M.context.linter_errors)
+
   local current_file = base_context.get_current_file(buf)
   local cursor_data = base_context.get_current_cursor_data(buf, win)
 
@@ -389,6 +397,14 @@ function M.load()
   M.context.cursor_data = cursor_data
   M.context.linter_errors = M.get_diagnostics(buf, nil, nil)
 
+  if
+    not vim.deep_equal(prev_current_file, M.context.current_file)
+    or not vim.deep_equal(prev_cursor_data, M.context.cursor_data)
+    or not vim.deep_equal(prev_linter_errors, M.context.linter_errors)
+  then
+    state.context_updated_at = vim.uv.now()
+  end
+
   -- Handle current selection
   if base_context.is_context_enabled('selection') then
     local current_selection = base_context.get_current_selection()
@@ -484,7 +500,11 @@ M.format_message = Promise.async(function(prompt, opts)
     return { parts = parts }
   end
 
-  if M.context.current_file and not M.context.current_file.sent_at then
+  if
+    base_context.is_context_enabled('current_file', context_config)
+    and M.context.current_file
+    and not M.context.current_file.sent_at
+  then
     table.insert(parts, format_file_part(M.context.current_file.path))
     set_file_sent_timestamps(M.context.current_file)
   end

lua/opencode/ui/context_bar.lua

@@ -171,7 +171,7 @@ end
 
 function M.setup()
   state.subscribe(
-    { 'current_context_config', 'current_code_buf', 'opencode_focused', 'context_updated_at', 'user_message_count' },
+    { 'current_context_config', 'current_code_buf', 'is_opencode_focused', 'context_updated_at', 'user_message_count' },
     function()
       M.render()
     end

tests/unit/context_bar_spec.lua

@@ -299,7 +299,8 @@ describe('opencode.ui.context_bar', function()
       assert.is_true(subscription_called)
       assert.is_table(captured_keys)
 
-      local expected_keys = { 'current_context_config', 'current_code_buf', 'opencode_focused', 'context_updated_at' }
+      local expected_keys =
+        { 'current_context_config', 'current_code_buf', 'is_opencode_focused', 'context_updated_at' }
       for _, expected_key in ipairs(expected_keys) do
         local found = false
         for _, key in ipairs(captured_keys) do