AutoTest: Fix enabling run buttons

If a parsing for tests is in progress the buttons might get enabled
but they should be disabled until the parsing has finished.

Change-Id: I3f089626983c219a9b54d8fc057a7ff51f11dc8c
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/autotest/testcodeparser.h

@@ -62,6 +62,7 @@ public:
     virtual ~TestCodeParser();
     void setState(State state);
     State state() const { return m_parserState; }
+    bool isParsing() const { return m_parserState == PartialParse || m_parserState == FullParse; }
     void setDirty() { m_dirty = true; }
 #ifdef WITH_TESTS
     bool furtherParsingExpected() const