Beautifier: Fix text selection for the Uncrustify

Extension of the selection of the text to full lines
does not work correctly if the selection is performed
from the top to the bottom.

Change-Id: I13a1bf9d6e92ebbbfd4f8190fb626dd3aca74686
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/beautifier/uncrustify/uncrustify.cpp

@@ -138,10 +138,13 @@ void Uncrustify::formatSelectedText()
     if (tc.hasSelection()) {
         // Extend selection to full lines
         const int posSelectionEnd = tc.selectionEnd();
+        tc.setPosition(tc.selectionStart());
         tc.movePosition(QTextCursor::StartOfLine);
         const int startPos = tc.position();
         tc.setPosition(posSelectionEnd);
-        tc.movePosition(QTextCursor::EndOfLine);
+        // Don't extend the selection if the cursor is at the start of the line
+        if (tc.positionInBlock() > 0)
+            tc.movePosition(QTextCursor::EndOfLine);
         const int endPos = tc.position();
         m_beautifierPlugin->formatCurrentFile(command(cfgFileName, true), startPos, endPos);
     } else if (m_settings->formatEntireFileFallback()) {