preserve serach field input

input for search is preserved on panel close if global variable
indicates that package folder should not be deleted.

The Variable is initialized to a nullstring if it does not exist.

Author: Matthias Kastner

procedures/CodeBrowser_gui.ipf

@@ -89,7 +89,7 @@ Function createPanel()
 	CheckBox $sortCtrl, userdata(ResizeControlsInfo) += A"zzzzzzzzzzzz!!#u:DuaGl<C]S6zzzzzzzzzz"
 	CheckBox $sortCtrl, userdata(ResizeControlsInfo) += A"zzz!!#N3Bk1ct<C]S6zzzzzzzzzzzzz!!!"
 
-	setGlobalStr("search", "")
+	setGlobalStr("search", getGlobalStr("search"))
 
 	SetVariable $searchCtrl, pos={panelBorder + 118, SortCtrlTop - 2}, size={175.00, 18.00}, proc=$(module + "#searchSet"),title = "search"
 	SetVariable $searchCtrl, limits={-inf,inf,0}, value=$(pkgFolder + ":search"), live = 1

procedures/CodeBrowser_hooks.ipf

@@ -66,7 +66,7 @@ Function initializePanel()
 
 	updatePanel()
 
-	setGlobalStr("search", "")
+	setGlobalStr("search", getGlobalStr("search"))
 End
 
 // Prepare for panel closing.