Utils: Introduce PathChoser::absoluteFilePath()

As we have a valid context to resolve relative files here
this is a good source for absolute files that don't depend
on QFilePath::absolute{File,}Path or similar.

Change-Id: Iaf592aa746023f80de517703e32e6b80a3d0fd7e
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Artem Sokolovskii <artem.sokolovskii@qt.io>

src/libs/utils/pathchooser.cpp

@@ -357,6 +357,11 @@ FilePath PathChooser::filePath() const
     return d->expandedPath(rawFilePath().toString());
 }
 
+FilePath PathChooser::absoluteFilePath() const
+{
+    return d->m_baseDirectory.resolvePath(filePath());
+}
+
 // FIXME: try to remove again
 QString PathChooser::expandedDirectory(const QString &input, const Environment &env,
                                        const QString &baseDir)

src/libs/utils/pathchooser.h

@@ -90,7 +90,8 @@ public:
     bool isValid() const;
     QString errorMessage() const;
 
-    FilePath filePath() const;
+    FilePath filePath() const; // Close to what's in the line edit.
+    FilePath absoluteFilePath() const; // Relative paths resolved wrt the specified base dir.
 
     QString rawPath() const; // The raw unexpanded input.
     FilePath rawFilePath() const; // The raw unexpanded input as FilePath.