Resize buffers in sparse! to satisfy buffer checks in constructor

[fredrikekre]

With this patch the output buffers to sparse! are resized in order to satisfy the buffer length checks in the SparseMatrixCSC constructor that were introduced in JuliaLang/julia#40523. Previously csccolptr was never resized, and cscrowval and cscnzval were only resized if the buffers were too short (i.e. never truncated).

The requirement length(csccolptr) >= n + 1 could be kept, but seems unnecessary since all buffers need to be resized anyway (to pass the constructor checks).

In particular this fixes calling sparse! with I, J, V as both input and output buffers: sparse!(I, J, V, m, n, ..., I, J, V).

Fixes #313.

[codecov-commenter]

Codecov Report

Merging #314 (40e989c) into main (57cbb74) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #314      +/-   ##
==========================================
+ Coverage   93.62%   93.68%   +0.05%     
==========================================
  Files          12       12              
  Lines        7390     7391       +1     
==========================================
+ Hits         6919     6924       +5     
+ Misses        471      467       -4     

Impacted Files	Coverage Δ
src/sparsematrix.jl	95.56% <100.00%> (+0.16%)	⬆️

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[github-actions]

The backport to 1.8 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.8 1.8
# Navigate to the new working tree
cd .worktrees/backport-1.8
# Create a new branch
git switch --create backport-314-to-1.8
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 85a381b2ea0f5e8a1553b51bc75a83dfc0445e36
# Push it to GitHub
git push --set-upstream origin backport-314-to-1.8
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.8

Then, create a pull request where the base branch is 1.8 and the compare/head branch is backport-314-to-1.8.

[github-actions]

The backport to 1.9 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.9 1.9
# Navigate to the new working tree
cd .worktrees/backport-1.9
# Create a new branch
git switch --create backport-314-to-1.9
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 85a381b2ea0f5e8a1553b51bc75a83dfc0445e36
# Push it to GitHub
git push --set-upstream origin backport-314-to-1.9
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.9

Then, create a pull request where the base branch is 1.9 and the compare/head branch is backport-314-to-1.9.