Fix sourcekit-lsp diagnostics counter (#1834)

* Fix sourcekit diagnostics counter

* Update changelog

Author: award999

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Improve error handling when the swift path is misconfigured ([#1801](https://github.com/swiftlang/vscode-swift/pull/1801))
 - Fix an error when performing "Run/Debug Tests Multiple Times" on Linux ([#1824](https://github.com/swiftlang/vscode-swift/pull/1824))
 - Fix the `> Swift: Run Swift Script` command not running unless a Swift Package folder is open ([#1832](https://github.com/swiftlang/vscode-swift/pull/1832))
+- Fix the SourceKit-LSP diagnostics reported progress ([#1799](https://github.com/swiftlang/vscode-swift/pull/1799))
 
 ## 2.11.20250806 - 2025-08-06
 

src/commands/captureDiagnostics.ts

@@ -332,9 +332,15 @@ async function sourcekitDiagnose(ctx: FolderContext, dir: string) {
         },
         async progress => {
             progress.report({ message: "Diagnosing SourceKit-LSP..." });
-            const writableStream = progressUpdatingWritable(percent =>
-                progress.report({ message: `Diagnosing SourceKit-LSP: ${percent}%` })
-            );
+            let lastProgress = 0;
+            const writableStream = progressUpdatingWritable(percentStr => {
+                const percent = parseInt(percentStr, 10);
+                progress.report({
+                    message: `Diagnosing SourceKit-LSP: ${percent}%`,
+                    increment: percent - lastProgress,
+                });
+                lastProgress = percent;
+            });
 
             await execFileStreamOutput(
                 serverPath,
@@ -362,7 +368,7 @@ function progressUpdatingWritable(updateProgress: (str: string) => void): Writab
     return new Writable({
         write(chunk, _encoding, callback) {
             const str = (chunk as Buffer).toString("utf8").trim();
-            const percent = /^([0-9])+%/.exec(str);
+            const percent = /^([0-9]+)%/.exec(str);
             if (percent && percent[1]) {
                 updateProgress(percent[1]);
             }