Problem: Wrong curswant when clicking on empty line or with vsplits.
Solution: Don't check for ScreenCols[] before the start of the window
and handle empty line properly.
closes: vim/vim#1313203cd697d63
Previously, a screen cell would occupy 28+4=32 bytes per cell
as we always made space for up to MAX_MCO+1 codepoints in a cell.
As an example, even a pretty modest 50*80 screen would consume
50*80*2*32 = 256000, i e a quarter megabyte
With the factor of two due to the TUI side buffer, and even more when
using msg_grid and/or ext_multigrid.
This instead stores a 4-byte union of either:
- a valid UTF-8 sequence up to 4 bytes
- an escape char which is invalid UTF-8 (0xFF) plus a 24-bit index to a
glyph cache
This avoids allocating space for huge composed glyphs _upfront_, while
still keeping rendering such glyphs reasonably fast (1 hash table lookup
+ one plain index lookup). If the same large glyphs are using repeatedly
on the screen, this is still a net reduction of memory/cache
consumption. The only case which really gets worse is if you blast
the screen full with crazy emojis and zalgo text and even this case
only leads to 4 extra bytes per char.
When only <= 4-byte glyphs are used, plus the 4-byte attribute code,
i e 8 bytes in total there is a factor of four reduction of memory use.
Memory which will be quite hot in cache as the screen buffer is scanned
over in win_line() buffer text drawing
A slight complication is that the representation depends on host byte
order. I've tested this manually by compling and running this
in qemu-s390x and it works fine. We might add a qemu based solution
to CI at some point.
The removes the previous restriction that nvim_buf_set_extmark()
could not be used to highlight arbitrary multi-line regions
The problem can be summarized as follows: let's assume an extmark with a
hl_group is placed covering the region (5,0) to (50,0) Now, consider
what happens if nvim needs to redraw a window covering the lines 20-30.
It needs to be able to ask the marktree what extmarks cover this region,
even if they don't begin or end here.
Therefore the marktree needs to be augmented with the information covers
a point, not just what marks begin or end there. To do this, we augment
each node with a field "intersect" which is a set the ids of the
marks which overlap this node, but only if it is not part of the set of
any parent. This ensures the number of nodes that need to be explicitly
marked grows only logarithmically with the total number of explicitly
nodes (and thus the number of of overlapping marks).
Thus we can quickly iterate all marks which overlaps any query position
by looking up what leaf node contains that position. Then we only need
to consider all "start" marks within that leaf node, and the "intersect"
set of that node and all its parents.
Now, and the major source of complexity is that the tree restructuring
operations (to ensure that each node has T-1 <= size <= 2*T-1) also need
to update these sets. If a full inner node is split in two, one of the
new parents might start to completely overlap some ranges and its ids
will need to be moved from its children's sets to its own set.
Similarly, if two undersized nodes gets joined into one, it might no
longer completely overlap some ranges, and now the children which do
needs to have the have the ids in its set instead. And then there are
the pivots! Yes the pivot operations when a child gets moved from one
parent to another.
Problem:
* The guessed botline might be smaller than the actual botline e.g. when
there are folds and the user is typing in insert mode. This may result
in incorrect treesitter highlights for injections.
* botline can be larger than the last line number of the buffer, which
results in errors when placing extmarks.
Solution:
* Take a more conservative approximation. I am not sure if it is
sufficient to guarantee correctness, but it seems to be good enough
for the case mentioned above.
* Clamp it to the last line number.
Co-authored-by: Lewis Russell <me@lewisr.dev>
Problem: Wrong cursor position with virtual text before double-width
char at window edge.
Solution: Check for double-width char before adding virtual text size.
closes: vim/vim#12977ac2d8815ae
Problem: Wrong cursor position with virtual text before a whitespace
character and 'linebreak'.
Solution: Always set "col_adj" to "size - 1" and apply 'linebreak' after
adding the size of 'breakindent' and 'showbreak'.
closes: vim/vim#129566e55e85f92
N/A patches:
vim-patch:9.0.1826: keytrans() doesn't translate recorded key typed in a GUI
Problem: Multiline regex with Visual selection fails when Visual
selection contains virtual text after last char.
Solution: Only include virtual text after last char when getting full
line length.
closes: vim/vim#12908e3daa06be1
Problem: Cursor position still wrong with 'showbreak' and virtual text
after last character or 'listchars' "eol".
Solution: Remove unnecessary w_wcol adjustment in curs_columns(). Also
fix first char of virtual text not shown at the start of a screen
line.
closes: vim/vim#12478closes: vim/vim#12532closes: vim/vim#129046a3897232a
Problem: Normal mode "gM", "gj", "gk" commands behave incorrectly with
virtual text.
Solution: Use linetabsize() instead of linetabsize_str().
closes: vim/vim#12909d809c0a903
Problem: Now way to show text at the bottom part of floating window
border (a.k.a. "footer").
Solution: Allows `footer` and `footer_pos` config fields similar to
`title` and `title_pos`.
Most of the messy things when changing a non-current buffer is
not about the buffer, it is about windows. In particular, it is about
`curwin`.
When editing a non-current buffer which is displayed in some other
window in the current tabpage, one such window will be "borrowed" as the
curwin. But this means if two or more non-current windows displayed the buffers,
one of them will be treated differenty. this is not desirable.
In particular, with nvim_buf_set_text, cursor _column_ position was only
corrected for one single window. Two new tests are added: the test
with just one non-current window passes, but the one with two didn't.
Two corresponding such tests were also added for nvim_buf_set_lines.
This already worked correctly on master, but make sure this is
well-tested for future refactors.
Also, nvim_create_buf no longer invokes autocmds just because you happened
to use `scratch=true`. No option value was changed, therefore OptionSet
must not be fired.
Problem: wrong cursor position with 'showbreak' and lcs-eol
Solution: Add size of 'showbreak' before when 'listchars' "eol" is used.
Also fix wrong cursor position with wrapping virtual text on
empty line and 'showbreak'.
closes: vim/vim#128911193951beb
Problem: Wrong display with wrapping virtual text or unprintable chars,
'showbreak' and 'smoothscroll'.
Solution: Don't skip cells taken by 'showbreak' in screen lines before
"w_skipcol". Combined "n_skip" and "skip_cells".
closes: vim/vim#12597b557f48982
Problem: Using freed memory when 'tagfunc' wipes out buffer that holds
'complete'.
Solution: Make a copy of the option. Make sure cursor position is valid.
0ff01835a4
Cherry-pick a cmdwin change from patch 9.0.0500.
Co-authored-by: Bram Moolenaar <Bram@vim.org>
Problem: Using setbufvar() may change the window title.
Solution: Do not redraw when creating the autocommand window. (closesvim/vim#9613)
dff97e65eb
Co-authored-by: Bram Moolenaar <Bram@vim.org>
Problem: Missing test coverage for blockwise Visual highlight with
virtual that starts with a double-width char.
Solution: Add a new virtual text to the test. Some other small fixes.
closes: vim/vim#12835fc3058495d
