taglist: refine search from buffer

When a taglist buffer lists tags from a search or thead buffer (with
`--msgs`) then selecting a tag lists all messages in the db with that
tag. This feels counter-intuitive.

Instead, remember the original query and refine the query by filtering
on the tag in addition to the original query.

alot/buffers/taglist.py

@@ -13,10 +13,11 @@ class TagListBuffer(Buffer):
 
     modename = 'taglist'
 
-    def __init__(self, ui, alltags=None, filtfun=lambda x: True):
+    def __init__(self, ui, alltags=None, filtfun=lambda x: True, querystring=None):
         self.filtfun = filtfun
         self.ui = ui
         self.tags = alltags or []
+        self.querystring = querystring
         self.isinitialized = False
         self.rebuild()
         Buffer.__init__(self, ui, self.body)

alot/commands/globals.py

@@ -579,24 +579,28 @@ def __init__(self, filtfun=lambda x: True, tags=None, match=None, msgs=False, **
         Command.__init__(self, **kwargs)
 
     def apply(self, ui):
+        querystring = None
         if self.tags:
             tags = self.tags
         elif self.msgs and isinstance(ui.current_buffer, buffers.SearchBuffer):
             tags = list(ui.dbman.query(ui.current_buffer.querystring).
                                           search_messages().collect_tags())
+            querystring = ui.current_buffer.querystring
         elif self.msgs and isinstance(ui.current_buffer, buffers.ThreadBuffer):
             tags = list(ui.current_buffer.thread.get_tags())
+            querystring = 'thread:%s' % ui.current_buffer.thread.get_thread_id()
         else:
             tags = ui.dbman.get_all_tags()
         blists = ui.get_buffers_of_type(buffers.TagListBuffer)
         if blists:
             buf = blists[0]
             buf.filtfun = self.filtfun
             buf.tags = tags
+            buf.querystring = querystring
             buf.rebuild()
             ui.buffer_focus(buf)
         else:
-            ui.buffer_open(buffers.TagListBuffer(ui, tags, self.filtfun))
+            ui.buffer_open(buffers.TagListBuffer(ui, tags, self.filtfun, querystring))
 
 
 @registerCommand(MODE, 'namedqueries')

alot/commands/taglist.py

@@ -13,6 +13,11 @@ class TaglistSelectCommand(Command):
 
     """search for messages with selected tag"""
     async def apply(self, ui):
-        tagstring = ui.current_buffer.get_selected_tag()
-        cmd = SearchCommand(query=['tag:"%s"' % tagstring])
+        tagstring = 'tag:"%s"' % ui.current_buffer.get_selected_tag()
+        querystring = ui.current_buffer.querystring
+        if querystring:
+            fullquerystring = '(%s) AND %s' % (querystring, tagstring)
+        else:
+            fullquerystring = tagstring
+        cmd = SearchCommand(query=[fullquerystring])
         await ui.apply_command(cmd)