test scenario is:
```
bash -c "sleep 5; for((i=0;i<30;i++)); do xdotool keydown --delay 0 Shift_L keydown --delay 0 9 keyup --delay 0 Shift_L keyup --delay 0 9; done"
```
That should cause a series of `(` characters to be emitted, but prior to
this commit is was usually mostly `9`'s.
What's changing here is:
* We copy the pertinent fields from the last xcb StateNotify event.
That ostensibly has the current modifier and layout state, but
because it comes from the X server, it doesn't factor in knowledge
from the IME.
* When processing an XCB key event, compute the current modifier
mask and override the XKB state with it.
* Now XKB will produce correct information about the key syms
* Restore the modifier state from the saved StateNotify information.
refs: https://github.com/wez/wezterm/pull/4151
refs: https://github.com/wez/wezterm/issues/4615
refs: https://github.com/fcitx/fcitx5/issues/893
refs: https://github.com/ibus/ibus/issues/2600
refs: https://github.com/wez/wezterm/issues/3840
this partially reverts eb3a78b0cb and
should hopefully resolve the underlying problem, which is that
the composition cursor is stuck at an empty string when using
a compose key on its own.
refs: https://github.com/wez/wezterm/issues/4841
It's not clear exactly how this triggers, but in setups where
a compose key has been configured (against the default for the
configured keyboard layout), it seems as though certain events
that indicate when composition is complete are not delivered,
leaving the compose cursor in an inconsistent state.
This commit attempts to detect that composing->!composing
state transition and bubble it up; when we return Nothing
and had previously had a composition string we're return
a bool to cause the caller to emit an event that clears
the composition state.
I'm not totally sure this is 100% right, but I think
it may help with the case we're discussing in
https://github.com/wez/wezterm/issues/4841
We have two different ways to compose:
* Via xkbd
* Via IME messages
In the latter case, we receive notifications from the IME about
the composed text, but are apparently not guaranteed to receive
them about the composition status overall.
This commit will synthesize clearing the composition status
when we receive the instruction to emit composed text.
The hope is that this will clear the compose cursor state
that appears to get stuck for some users of ibus + Gnome 45.
refs: https://github.com/wez/wezterm/issues/4841
DiffState keeps track of a virtual cursor in order to skip emitting
cursor location changes when a previous text change has already moved
the cursor to the desired position. However, currently the code always
advances the cursor by 1 column for each added text change regardless
of the width of the text.
Fix behavior by advancing the cursor by the width of the text.
To avoid having to add a new variable, make 'self.cursor' contain
the cursor position for the next cell instead of the current cell.
In addition, add a test verifying the behavior.
The present code for creating diffs between surface regions processes
visible cells from both surfaces in lockstep. This only works when
the cells at each position have the same width in each surface.
When widths differ, the iterators go out of sync and end up comparing
cells in different positions of the surface, resulting in incorrect
diffs.
Fix this by instead iterating over the source surface ('other'), and
for each cell locating the corresponding cell in the target surface
to compare against.
To apply the fix to all three diffing functions, outline the per-line
code to a new function and call it in each function.
Also add a test that verifies the behavior in such case with differing
cell widths.
Procedure is:
* Download the `NerdFontsSymbolsOnly.zip` release asset
* Extract the font into assets/fonts
* Run the codegen to update nerdfonts_data.rs:
`cd termwiz/codgen ; cargo run`
* Apply formatting: `cd ../../ ; cargo +nightly fmt`
* Update the list of symbols in the docs:
* edit `docs/config/lua/wezterm/nerdfonts.md`
* delete the table
* Run the embedded vim command that will regenerate the table
refs: https://github.com/wez/wezterm/pull/4656
