Add distinct w (curr buf) / W (all buf) word completion for <c-x>

README.asciidoc

@@ -1224,8 +1224,9 @@ reached (see `idle_timeout` option). Insert mode completion can be explicitly tr
 using `<c-x>`, followed, by:
 
  * *f* : filename completion
- * *w* : buffer word completion
- * *l* : buffer line completion
+ * *w* : word completion (current buffer)
+ * *W* : word completion (all buffers)
+ * *l* : line completion (current buffer)
 
 Completion candidates can be selected using `<c-n>` and `<c-p>`.
 

doc/manpages/keys.asciidoc

@@ -50,7 +50,10 @@ Insert mode
 		explicit file completion
 
 	*w*:::
-		explicit word completion
+		explicit word completion (current buffer)
+
+	*W*:::
+		explicit word completion (all buffers)
 
 	*l*:::
 		explicit line completion

src/input_handler.cc

@@ -1208,12 +1208,15 @@ public:
                     if (key.key == 'f')
                         m_completer.explicit_file_complete();
                     if (key.key == 'w')
-                        m_completer.explicit_word_complete();
+                        m_completer.explicit_word_buffer_complete();
+                    if (key.key == 'W')
+                        m_completer.explicit_word_all_complete();
                     if (key.key == 'l')
                         m_completer.explicit_line_complete();
             }, "enter completion type",
             "f: filename\n"
-            "w: word\n"
+            "w: word (current buffer)\n"
+            "W: word (all buffers)\n"
             "l: line\n");
             update_completions = false;
         }

src/insert_completer.cc

@@ -548,7 +548,13 @@ void InsertCompleter::explicit_file_complete()
     m_explicit_completer = complete_filename<false>;
 }
 
-void InsertCompleter::explicit_word_complete()
+void InsertCompleter::explicit_word_buffer_complete()
+{
+    try_complete(complete_word<false>);
+    m_explicit_completer = complete_word<false>;
+}
+
+void InsertCompleter::explicit_word_all_complete()
 {
     try_complete(complete_word<true>);
     m_explicit_completer = complete_word<true>;

src/insert_completer.hh

@@ -86,7 +86,8 @@ public:
     void reset();
 
     void explicit_file_complete();
-    void explicit_word_complete();
+    void explicit_word_buffer_complete();
+    void explicit_word_all_complete();
     void explicit_line_complete();
 
 private: