Allow changing the colour of wxInfoBarGeneric text.

Override SetForegroundColour() to forward it to the text control.

See #15671.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75208 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/infobar.h

@@ -79,6 +79,9 @@ public:
     // (default font is a larger and bold version of the normal one)
     virtual bool SetFont(const wxFont& font);
 
+    // same thing with the colour: this affects the text colour
+    virtual bool SetForegroundColour(const wxColor& colour);
+
 protected:
     // info bar shouldn't have any border by default, the colour difference
     // between it and the main window separates it well enough