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Richard Mahn 98f7013756
Prevent NPE in CSV diff rendering when column removed (#17018)
Fixes #16837 if a column is deleted.

We were clobbering the columns that were added by looping through the aline (base) and then when bline (head) was looped through, it clobbered what was in the "cells" array that is show in the diff, and then left a nil cell because nothing was shifted.

This fix properly shifts the cells, and properly puts the b cell either at its location or after, according to what the aline placed in the cells.

This includes test, adding a new test function since adding/removing cells works best with three columns, not two, which results in 4 columns of the resulting cells because it has a deleted column and an added column. If you try this locally, you can try those cases and others, such as adding a column.

There was no need to do anything special for the rows when `aline == 0 || bline == 0` so that was removed. This allows the same code to be used for removed or added lines, with the bcell text always being the RightCell, acell text being the LeftCell.

I still added the patch zeripath gave at https://github.com/go-gitea/gitea/issues/16837#issuecomment-913007382 so that just in case for some reason a cell is nil (which shouldn't happen now) it doesn't throw a 500 error, so the user can at least view the raw diff.

Also fixes in the [view.go](https://github.com/go-gitea/gitea/pull/17018/files#diff-43a7f4747c7ba8bff888c9be11affaafd595fd55d27f3333840eb19df9fad393L521) file how if a CSV file is empty (either created empty or if you edit it and remove all contents) it throws a huge 500 error when you then save it (when you view the file). Since we allow creating, saving and pushing empty files, we shouldn't throw an error on an empty CSV file, but just show its empty contents. This doesn't happen if it is a Markdown file or other type of file that is empty.
EDIT: Now handled in the markup/csv renderer code
3 years ago
..
branch Split `index.js` to separate files (#17315) 3 years ago
diff Prevent NPE in CSV diff rendering when column removed (#17018) 3 years ago
editor Add attachments for PR reviews (#16075) 3 years ago
graph Use pulls in commit graph unless pulls are disabled (#15774) 3 years ago
issue "Copy branch name" button in pull request (#17323) 3 years ago
migrate Disable form autofill (#17291) 3 years ago
projects Kanban colored boards (#16647) 3 years ago
pulls Enforce tab indentation in templates (#15289) 3 years ago
release Prevent 500 on draft releases without tag (#16634) 3 years ago
settings Disable form autofill (#17291) 3 years ago
wiki Add edit button to wiki sidebar and footer (#16719) 3 years ago
activity.tmpl Frontend refactor: move Vue related code from `index.js` to `components` dir, and remove unused codes. (#17301) 3 years ago
blame.tmpl Link to previous blames in file blame page (#16259) 3 years ago
branch_dropdown.tmpl Fix extra curly brace breaking release compare (#15988) 3 years ago
clone_buttons.tmpl "Copy branch name" button in pull request (#17323) 3 years ago
commit_page.tmpl Enforce tab indentation in templates (#15289) 3 years ago
commit_status.tmpl Show dropdown with all statuses for commit (#13977) 4 years ago
commit_statuses.tmpl Show dropdown with all statuses for commit (#13977) 4 years ago
commits.tmpl Add compare tag dropdown to releases page (#15695) 3 years ago
commits_list.tmpl Replace `list.List` with slices (#16311) 3 years ago
commits_list_small.tmpl Replace `list.List` with slices (#16311) 3 years ago
commits_table.tmpl Show correct text when comparing commits on empty pull request (#16569) 3 years ago
create.tmpl fixed create repo page layout (#17012) 3 years ago
empty.tmpl Fix default push instructions on empty repos (#16302) 3 years ago
forks.tmpl Direct avatar rendering (#13649) 4 years ago
graph.tmpl Kanban colored boards (#16647) 3 years ago
header.tmpl Add push to remote mirror repository (#15157) 3 years ago
home.tmpl Add bundle download for repository (#14538) 3 years ago
icon.tmpl Do not display org avatar near icon for internal repos (#13957) 4 years ago
search.tmpl Issue sidebar and misc css fixes (#15524) 3 years ago
shabox_badge.tmpl Fix avatar template error (#13833) 4 years ago
sub_menu.tmpl Move macaron to chi (#14293) 3 years ago
upload.tmpl Add attachments for PR reviews (#16075) 3 years ago
user_cards.tmpl Direct avatar rendering (#13649) 4 years ago
view_file.tmpl Frontend refactor: move Vue related code from `index.js` to `components` dir, and remove unused codes. (#17301) 3 years ago
view_list.tmpl Defer Last Commit Info (#16467) 3 years ago
watchers.tmpl Add class to page content to unify top margin (#13766) 4 years ago