[patch] load images from filesystem if not found in the resources

[Bernhard Roider]

as the subject says: this patch makes it possible again to cusomize the toolbars with user defined 
images. if nobody objects i'll put it in tomorrow.

bernhard
Index: src/frontends/qt4/GuiToolbar.cpp
===================================================================
--- src/frontends/qt4/GuiToolbar.cpp    (revision 21075)
+++ src/frontends/qt4/GuiToolbar.cpp    (working copy)
@@ -33,6 +33,7 @@
 #include "qt_helpers.h"
 #include "InsertTableWidget.h"
 
+#include "support/filetools.h"
 #include "support/lstrings.h"
 #include "support/lyxalgo.h" // sorted
 
@@ -59,6 +60,7 @@
 using std::string;
 using std::endl;
 
+using support::libFileSearch;
 using support::subst;
 using support::compare;
 
@@ -171,15 +173,20 @@
        QPixmap pm;
        string name1;
        string name2;
+       string path;
+       string fullname;
 
        switch (f.action) {
        case LFUN_MATH_INSERT:
-               if (!f.argument().empty())
-                       name1 = "math/" + 
find_png(to_utf8(f.argument()).substr(1));
+               if (!f.argument().empty()) {
+                       path = "math/";
+                       name1 = find_png(to_utf8(f.argument()).substr(1));
+               }
                break;
        case LFUN_MATH_DELIM:
        case LFUN_MATH_BIGDELIM:
-               name1 = "math/" + find_png(to_utf8(f.argument()));
+               path = "math/";
+               name1 = find_png(to_utf8(f.argument()));
                break;
        default:
                name2 = lyxaction.getActionName(f.action);
@@ -189,12 +196,20 @@
                        name1 = subst(name2 + ' ' + to_utf8(f.argument()), ' ', 
'_');
        }
 
-       if (pm.load(":/images/" + toqstr(name1) + ".png"))
+       if (pm.load(":/images/" + toqstr(path + name1) + ".png"))
                return pm;
 
-       if (pm.load(":/images/" + toqstr(name2) + ".png"))
+       if (pm.load(":/images/" + toqstr(path + name2) + ".png"))
                return pm;
 
+       fullname = libFileSearch("images/" + path, name1, "png").absFilename();
+       if (pm.load(toqstr(fullname)))
+               return pm;
+
+       fullname = libFileSearch("images/" + path, name2, "png").absFilename();
+       if (pm.load(toqstr(fullname)))
+               return pm;
+
        LYXERR(Debug::GUI) << "Cannot find icon for command \""
                           << lyxaction.getActionName(f.action)
                           << '(' << to_utf8(f.argument()) << ")\"" << endl;