- Fix a bug where it was not possible to add a database folder if the folder name starts with `db-`. [#1565](https://github.com/github/vscode-codeql/pull/1565)
- Add commands for navigating up, down, left, or right in the result viewer. Previously there were only commands for moving up and down the currently-selected path. We suggest binding keyboard shortcuts to these commands, for navigating the result viewer using the keyboard. [#1568](https://github.com/github/vscode-codeql/pull/1568)
- Remove the ability to manually upgrade databases from the context menu on databases. Databases are non-destructively upgraded automatically so for most users this was not needed. For advanced users this is still available in the Command Palette. [#1501](https://github.com/github/vscode-codeql/pull/1501)
- Always restart the query server after a manual database upgrade. This avoids a bug in the query server where an invalid dbscheme was being retained in memory after an upgrade. [#1519](https://github.com/github/vscode-codeql/pull/1519)
- Fix a race condition that could cause a failure to open the evaluator log when running a query. [#1490](https://github.com/github/vscode-codeql/pull/1490)
- Fix an error when running a query with an older version of the CodeQL CLI. [#1490](https://github.com/github/vscode-codeql/pull/1490)
- Fix a bug where quick queries cannot be compiled if the core libraries are not in the workspace. [#1411](https://github.com/github/vscode-codeql/pull/1411)
- Fix a bug where quick evaluation of library files would display an error message when using CodeQL CLI v2.10.0. [#1412](https://github.com/github/vscode-codeql/pull/1412)
- Fix a bug where the AST viewer was not synchronizing its selected node when the editor selection changes. [#1230](https://github.com/github/vscode-codeql/pull/1230)
- Open the directory in the finder/explorer (instead of just highlighting it) when running the "Open query directory" command from the query history view. [#1235](https://github.com/github/vscode-codeql/pull/1235)
- Ensure query label in the query history view changes are persisted across restarts. [#1235](https://github.com/github/vscode-codeql/pull/1235)
- Fix a bug where database upgrades could not be resolved if some of the target pack's dependencies are outside of the workspace. [#1138](https://github.com/github/vscode-codeql/pull/1138)
- Open the query server logs for query errors (instead of the extension log). This will make it easier to track down query errors. [#1158](https://github.com/github/vscode-codeql/pull/1158)
- [BREAKING CHANGE] The `codeQL.runningQueries.customLogDirectory` setting is deprecated and no longer has any function. Instead, all query log files will be stored in the query history directory, next to the query results. [#1178](https://github.com/github/vscode-codeql/pull/1178)
- Add a _Open query directory_ command for query items. This command opens the directory containing all artifacts for a query. [#1179](https://github.com/github/vscode-codeql/pull/1179)
- Add options to display evaluator logs for a given query run. Some information that was previously found in the query server output may now be found here. [#1186](https://github.com/github/vscode-codeql/pull/1186)
- Fix a bug where invoking _View AST_ from the file explorer would not view the selected file. Instead it would view the active editor. Also, prevent the _View AST_ from appearing if the current selection includes a directory or multiple files. [#1113](https://github.com/github/vscode-codeql/pull/1113)
- Add query history items as soon as a query is run, including new icons for each history item. [#1094](https://github.com/github/vscode-codeql/pull/1094)
- Save query history items across restarts. Items will be saved for 30 days and can be overwritten by setting the `codeQL.queryHistory.ttl` configuration setting. [#1130](https://github.com/github/vscode-codeql/pull/1130)
- Add packaging-related commands. _CodeQL: Download Packs_ downloads query packs from the package registry that can be run locally, and _CodeQL: Install Pack Dependencies_ installs dependencies for packs in your workspace. [#1076](https://github.com/github/vscode-codeql/pull/1076)
- Avoid creating a third column when opening the results view. The results view will always open to the right of the active editor, unless the active editor is in the rightmost editor column. In that case open in the leftmost column. [#1037](https://github.com/github/vscode-codeql/pull/1037)
- Add a CodeLens to make the Quick Evaluation command more accessible. Click the `Quick Evaluation` prompt above a predicate definition in the editor to evaluate that predicate on its own. You can enable/disable this feature in the `codeQL.runningQueries.quickEvalCodelens` setting. [#1035](https://github.com/github/vscode-codeql/pull/1035) & [#1052](https://github.com/github/vscode-codeql/pull/1052)
- Fix a bug where the _Alerts_ option would show in the results view even if there is no alerts table available. [#1038](https://github.com/github/vscode-codeql/pull/1038)
- Emit a more explicit error message when a user tries to add a database with an unzipped source folder to the workspace. [#1021](https://github.com/github/vscode-codeql/pull/1021)
- Ensure `src.zip` archives are used as the canonical source instead of `src` folders when importing databases. [#1025](https://github.com/github/vscode-codeql/pull/1025)
- Fix a bug that shows 'Set current database' when hovering over the currently selected database in the databases view. [#976](https://github.com/github/vscode-codeql/pull/976)
- Fix a bug with importing large databases. Databases over 4GB can now be imported directly from LGTM or from a zip file. This functionality is only available when using CodeQL CLI version 2.6.0 or later. [#971](https://github.com/github/vscode-codeql/pull/971)
- Replace certain control codes (`U+0000` - `U+001F`) with their corresponding control labels (`U+2400` - `U+241F`) in the results view. [#963](https://github.com/github/vscode-codeql/pull/963)
- Allow case-insensitive project slugs for GitHub repositories when adding a CodeQL database from LGTM. [#978](https://github.com/github/vscode-codeql/pull/961)
- Add a _CodeQL: Preview Query Help_ command to generate Markdown previews of `.qhelp` query help files. This command should only be run in trusted workspaces. See [the CodeQL CLI docs](https://codeql.github.com/docs/codeql-cli/testing-query-help-files) for more information about query help. [#988](https://github.com/github/vscode-codeql/pull/988)
- Fix a bug where result set names in the result set drop-down were disappearing when viewing a sorted table. [#1007](https://github.com/github/vscode-codeql/pull/1007)
- Allow query result locations with 0 as the end column value. These are treated as the first column in the line. [#1002](https://github.com/github/vscode-codeql/pull/1002)
- Add progress messages to LGTM download option. This makes the two-step process (selecting a project, then selecting a language) more clear. [#960](https://github.com/github/vscode-codeql/pull/960)
- Remove line about selecting a language from the dropdown when downloading database from LGTM. This makes the download progress visible when the popup is not expanded. [#957](https://github.com/github/vscode-codeql/pull/957)
- Add an option _View Results (CSV)_ to view the results of a non-alert query. The existing options for alert queries have been renamed to _View Alerts_ to avoid confusion. [#929](https://github.com/github/vscode-codeql/pull/929)
- Fix bug where _View AST_ fails due to recent refactoring in the standard library and query packs. [#939](https://github.com/github/vscode-codeql/pull/939)
- Add a command _CodeQL: Run Query on Multiple Databases_, which lets users select multiple databases to run a query on. [#898](https://github.com/github/vscode-codeql/pull/898)
- Autodetect what language a query targets. This refines the _CodeQL: Run Query on Multiple Databases_ command to only show relevant databases. [#915](https://github.com/github/vscode-codeql/pull/915)
- Adjust test log output to display diffs only when comparing failed test results with expected test results. [#920](https://github.com/github/vscode-codeql/pull/920)
- Add the _Add Database Source to Workspace_ command to the right-click context menu in the databases view. This lets users re-add a database's source folder to the workspace and browse the source code. [#891](https://github.com/github/vscode-codeql/pull/891)
- Fix markdown rendering in the description of the `codeQL.cli.executablePath` setting. [#908](https://github.com/github/vscode-codeql/pull/908)
- Allow users to specify a custom directory for storing query server logs (`codeQL.runningQueries.customLogDirectory`). The extension will not delete these logs automatically. [#863](https://github.com/github/vscode-codeql/pull/863)
- Support the VS Code [Workspace Trust feature](https://code.visualstudio.com/docs/editor/workspace-trust). This extension is now enabled in untrusted workspaces, but it restricts commands that contain arbitrary paths. [#861](https://github.com/github/vscode-codeql/pull/861)
- Allow the `codeQL.cli.executablePath` configuration setting to be set in workspace-scoped configuration files. This means that each workspace can now specify its own CodeQL CLI compiler, a feature that is unblocked due to implementing Workspace Trust. [#861](https://github.com/github/vscode-codeql/pull/861)
- Copy version information to the clipboard when a user clicks the CodeQL section of the status bar. [#845](https://github.com/github/vscode-codeql/pull/845)
- Ensure changes in directories that contain tests will be properly updated in the test explorer. [#846](https://github.com/github/vscode-codeql/pull/846)
- Introduce evaluator options for saving intermediate results to the disk cache (`codeQL.runningQueries.saveCache`) and for limiting the size of this cache (`codeQL.runningQueries.cacheSize`). [#778](https://github.com/github/vscode-codeql/pull/778)
- Respect the `codeQL.runningQueries.numberOfThreads` setting when creating SARIF files during result interpretation. [#771](https://github.com/github/vscode-codeql/pull/771)
- Avoid displaying an error when removing orphaned databases and the storage folder does not exist. [#748](https://github.com/github/vscode-codeql/pull/748)
- Add better error messages when AST Viewer is unable to create an AST. [#753](https://github.com/github/vscode-codeql/pull/753)
- Cache AST viewing operations so that subsequent calls to view the AST of a single file will be extremely fast. [#753](https://github.com/github/vscode-codeql/pull/753)
- Add a _More Information_ button in the telemetry popup that opens the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code) in a browser tab. [#742](https://github.com/github/vscode-codeql/pull/742)
- On a strictly opt-in basis, collect anonymized usage data from the VS Code extension, helping improve CodeQL's usability and performance. See the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code) for more information on exactly what data is collected and what it is used for. [#611](https://github.com/github/vscode-codeql/pull/611)
- Ensure databases are unlocked when removing them from the workspace. This will ensure that after a database is removed from VS Code, queries can be run on it from the command line without restarting the IDE. Requires CodeQL CLI 2.4.1 or later. [#681](https://github.com/github/vscode-codeql/pull/681)
- Fix bug when removing databases where sometimes the source folder would not also be removed from the workspace or the database files would not be deleted from the workspace storage location. [#692](https://github.com/github/vscode-codeql/pull/692)
- Query results with no string representation will now be displayed with placeholder text in query results. Previously, they were omitted. [#694](https://github.com/github/vscode-codeql/pull/694)
- Add a label for the language of a database in the databases view. This will only take effect for new databases created with the CodeQL CLI v2.4.1 or later. [#697](https://github.com/github/vscode-codeql/pull/697)
- Add clearer error message when running a query using a missing or invalid qlpack. [#702](https://github.com/github/vscode-codeql/pull/702)
- Add clearer error message when trying to run a command from the query history view if no item in the history is selected. [#702](https://github.com/github/vscode-codeql/pull/702)
- Fix a bug where it is not possible to download some database archives. This fix specifically addresses large archives and archives whose central directories do not align with file headers. [#700](https://github.com/github/vscode-codeql/pull/700)
- Avoid error dialogs when QL test discovery or database cleanup encounters a missing directory. [#706](https://github.com/github/vscode-codeql/pull/706)
- Add the _CodeQL: View AST_ command to the right-click context menu when a source file in a database source archive is open in the editor. [#712](https://github.com/github/vscode-codeql/pull/712)
- Editors opened by navigating from the results view are no longer opened in _preview mode_. Now they are opened as a persistent editor. [#630](https://github.com/github/vscode-codeql/pull/630)
- When comparing the results of a failed QL test run and the `.expected` file does not exist, an empty `.expected` file is created and compared against the `.actual` file. [#669](https://github.com/github/vscode-codeql/pull/669)
- Alter structure of the _Test Explorer_ tree. It now follows the structure of the filesystem instead of the QL Packs. [#624](https://github.com/github/vscode-codeql/pull/624)
- Alter structure of the _Test Explorer_ tree. It now follows the structure of the filesystem instead of the QL Packs. [#624](https://github.com/github/vscode-codeql/pull/624)
- Add more structured output for tests. [#626](https://github.com/github/vscode-codeql/pull/626)
- Whenever the extension restarts, orphaned databases will be cleaned up. These are databases whose files are located inside of the extension's storage area, but are not imported into the workspace.
- Add a `codeQl.resultsDisplay.pageSize` setting to configure the number of results displayed in a single results view page. Increase the default page size from 100 to 200. [#686](https://github.com/github/vscode-codeql/pull/686)
- Update the AST Viewer to include edge labels (if available) in addition to the target node labels. So far, only C/C++ databases take advantage of this change. [#688](https://github.com/github/vscode-codeql/pull/688)
- The maximum number of simultaneous queries launchable by the `CodeQL: Run Queries in Selected Files` command is now configurable by changing the `codeQL.runningQueries.maxQueries` setting.
- Allow setting `codeQL.runningQueries.numberOfThreads` and `codeQL.runningTests.numberOfThreads` to 0, (which is interpreted as 'use one thread per core on the machine').
- Add a `View DIL` command on query history items. This opens a text editor containing the Datalog Intermediary Language representation of the compiled query.
- Remove feature flag for the AST Viewer. For more information on how to use the AST Viewer, [see the documentation](https://help.semmle.com/codeql/codeql-for-vscode/procedures/exploring-the-structure-of-your-source-code.html).
- Ensure compare order is consistent when selecting two queries to compare. The first query selected is always the _from_ query and the query selected later is always the _to_ query.
- Change `codeQL.cli.executablePath` to a per-machine setting, so it can no longer be set at the user or workspace level. This helps prevent arbitrary code execution when using a VS Code workspace from an untrusted source.
- Improve the highlighting of the selected query result within the source code.
- Improve the performance of switching between result tables in the CodeQL Query Results view.
- Fix the automatic upgrading of CodeQL databases when using upgrade scripts from the workspace.
- Allow removal of items from the CodeQL Query History view.
