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UI/nvim_ui_attach(): add override option

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Before now, Nvim always degrades UI capabilities to the lowest-common
denominator. For example, if any connected UI has `ext_messages=false`
then `ext_messages=true` requested by any other connected UI is ignored.

Now `nvim_ui_attach()` supports `override=true`, which flips the
behavior: if any UI requests an `ext_*` UI capability then the
capability is enabled (and the legacy behavior is disabled).

Legacy UIs will be broken while a `override=true` UI is connected, but
it's useful for debugging: you can type into the TUI and observe the UI
events from another connected (UI) client. And the legacy UI will
"recover" after the `override=true` UI disconnects.

Example using pynvim:

    >>> n.ui_attach(2048, 2048, rgb=True, override=True, ext_multigrid=True, ext_messages=True, ext_popupmenu=True)
    >>> while True: n.next_message();
This commit is contained in:
Justin M. Keyes
2019-05-09 19:35:38 +02:00
parent 8330cc22af
commit b9ad12e6c2
9 changed files with 64 additions and 32 deletions
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2
runtime/doc/debug.txt
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@@ -108,7 +108,7 @@ line numbers. Double-click one of the lines and the Find Source dialog will
appear. Navigate to the directory where the Vim source is (if you have it.)
If you don't know how to debug this any further, follow the instructions
at ":help bug-reports". Paste the call stack into the bug report.
at ":help bug-report". Paste the call stack into the bug report.
If you have a non-free version of Visual Studio, you can save a minidump via
the Debug menu and send it with the bug report. A minidump is a small file