OpenGL: use const (and const APIs) more

For CoW types, prefer const methods to avoid needless detach()ing.

Change-Id: I211ae74434bf3705914764e1e9d02ae823a1be3a
Reviewed-by: Edward Welbourne <edward.welbourne@theqtcompany.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
index fff64506ab..ec673e8726 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
@@ -333,7 +333,7 @@ QByteArray QGLEngineSharedShaders::snippetNameStr(SnippetName name)
 QGLEngineShaderProg *QGLEngineSharedShaders::findProgramInCache(const QGLEngineShaderProg &prog)
 {
     for (int i = 0; i < cachedPrograms.size(); ++i) {
-        QGLEngineShaderProg *cachedProg = cachedPrograms[i];
+        QGLEngineShaderProg *cachedProg = cachedPrograms.at(i);
         if (*cachedProg == prog) {
             // Move the program to the top of the list as a poor-man's cache algo
             cachedPrograms.move(i, 0);