Adds option to force update same task mentions in current file

doc/taskwiki.txt

@@ -767,6 +767,15 @@ constructs.
         Example:
         let g:taskwiki_maplocalleader=",t"
 
+*taskwiki_scan_for_duplicates*
+    If set to a non-empty value (such as "yes"), taskwiki will force-scan the
+    current file for other mentions of the task being processed and update
+    them too. This is useful if you have multiple overlapping viewports. If
+    you edit a task that appears in several of these viewports (e.g. mark it
+    as done) and save the file, the non-updated mentions of the task may undo
+    your edits. This option is disabled by default as it will add some
+    overhead to simple operations that you perform on selected tasks.
+
 =============================================================================
 9. TROUBLESHOOTING					   *taskwiki-trouble*
 

taskwiki/cache.py

@@ -313,3 +313,6 @@ def get_relevant_tw(self):
 
     def get_relevant_completion(self):
         return self.completion[self.get_relevant_tw()]
+
+    def get_task_replications(self, uuid):
+        return [vwtask for vwtask in self.vwtask.values() if vwtask and vwtask.uuid == uuid]

taskwiki/main.py

@@ -79,6 +79,10 @@ def __init__(self):
         self.tw = cache().get_relevant_tw()
 
         # Load the current tasks
+        if util.get_var('taskwiki_scan_for_duplicates'):
+            for i in range(len(cache().buffer)):
+                cache().vwtask[i]  # loads the line into the cache
+
         range_tasks = [cache().vwtask[i] for i in util.selected_line_numbers()]
         self.tasks = [t for t in range_tasks if t is not None]
 
@@ -114,6 +118,8 @@ def done(self):
             vimwikitask.update_in_buffer()
             print(u"Task \"{0}\" completed.".format(vimwikitask['description']))
 
+        self._update_replications()
+
         cache().buffer.push()
         self.save_action('done')
 
@@ -277,6 +283,14 @@ def sort(self, sortstring):
         sort.TaskSorter(cache(), self.tasks, sortstring).execute()
         cache().buffer.push()
 
+    def _update_replications(self):
+        """Update all same tasks occurrences in current buffer from taskwarrior."""
+
+        for vimwikitask in self.tasks:
+            for replica in cache().get_task_replications(vimwikitask.uuid):
+                replica.update_from_task()
+                replica.update_in_buffer()
+
 
 class Mappings(object):