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Longer name, but it doesn't lie. We have no data structure right now for
combining multiple code points. And it makes no sense for the notion of
a grapheme to conflate its Unicode encoding.
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In the process we eliminate a whole bunch of duplication and give item
navigation a single source of truth.
Page-up isn't quite _identical_ to how it used to be before. Let's see
if it bothers us.
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new test:
hit enter, go to thread view, hit enter again, go into thread view again. No crash.
Just bite the bullet and make item-index robust to single-thread tabs.
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Tests to create when I start creating tests:
hide an item. Cursor moves to a new item.
hide an item that's not the bottom-most item, hit down arrow. Cursor moves to a new item.
hide an item that's not the top-most item, hit up arrow. Cursor moves to a new item.
hide top-most item. Cursor on new item. Hit up arrow. No change. Scroll down. New item.
hide bottom-most item. Cursor on new item. Hit down arrow. No change. Scroll up. New item.
open a thread. Hit down arrow. No crash (item-index not called).
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To hide all comments from the same thread as the item at cursor, press
ctrl-h.
To later unhide everything, press ctrl-u.
Currently ctrl-u works by creating a whole new tab (that you can back
out of using Esc). That gives a way to undo it.
Still some rough edges:
update number of items in view when hiding a thread
avoid clipping menu in channel view
undo a single hide without giving up previous ones
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By definition that function can't support combining characters.
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Unix text-mode terminals transparently support utf-8 these days, and so
I treat utf-8 sequences (which I call graphemes in Mu) as fundamental.
I then blindly carried over this state of affairs to bare-metal Mu,
where it makes no sense. If you don't have a terminal handling
font-rendering for you, fonts are most often indexed by code points and
not utf-8 sequences.
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Now that it's been used in a second app without needing any changes.
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Test required.
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Make it more obvious that we always do a full repaint if dirty is set.
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