Handle inconsistent casing

src/paths.ts

@@ -31,6 +31,12 @@ export function convertDebuggerPathToClient(fileUri: string|url.Url, localSource
 
 /** converts a local path from VS Code to a server-side XDebug file URI with respect to source root settings */
 export function convertClientPathToDebugger(localPath: string, localSourceRoot?: string, serverSourceRoot?: string): string {
+    if (localSourceRoot) {
+        localSourceRoot = localSourceRoot.replace(/^[a-zA-Z]:\\/, match => match.toLowerCase());
+    }
+    if (serverSourceRoot) {
+        serverSourceRoot = serverSourceRoot.replace(/^[a-zA-Z]:\\/, match => match.toLowerCase());
+    }
     let localFileUri = fileUrl(localPath, {resolve: false});
     let serverFileUri: string;
     if (serverSourceRoot && localSourceRoot) {

src/test/paths.ts

@@ -47,6 +47,14 @@ describe('paths', () => {
                     'file:///var/www/test.php'
                 );
             });
+            it('should convert a windows path with inconsistent casing to a unix URI', () => {
+                const localSourceRoot = 'C:\\Users\\felix\\myproject';
+                const serverSourceRoot = '/var/www';
+                assert.equal(
+                    convertClientPathToDebugger('c:\\Users\\felix\\myproject\\test.php', localSourceRoot, serverSourceRoot),
+                    'file:///var/www/test.php'
+                );
+            });
             it('should convert a windows path to a windows URI', () => {
                 const localSourceRoot = 'C:\\Users\\felix\\myproject';
                 const serverSourceRoot = 'C:\\Program Files\\Apache\\2.4\\htdocs';