MAINT-3642 FIXED Allow saving textures with extension “.tga” at the end of the name.

indra/newview/llfilepicker.cpp

@@ -662,7 +662,7 @@ bool	LLFilePicker::doNavSaveDialog(ESaveFilter filter, const std::string& filena
 		case FFSAVE_TGAPNG:
 			type = "PNG";
 			creator = "prvw";
-			extension = "png";
+			extension = "png,tga";
 			break;
 		case FFSAVE_BMP:
 			type = "BMPf";

indra/newview/llfilepicker_mac.mm

@@ -107,7 +107,7 @@ std::string* doSaveDialog(const std::string* file,
     NSSavePanel *panel = [NSSavePanel savePanel]; 
     
     NSString *extensionns = [NSString stringWithCString:extension->c_str() encoding:[NSString defaultCStringEncoding]];
-    NSArray *fileType = [[NSArray alloc] initWithObjects:extensionns,nil];
+    NSArray *fileType = [extensionns componentsSeparatedByString:@","];
     
     //[panel setMessage:@"Save Image File"]; 
     [panel setTreatsFilePackagesAsDirectories: ( flags & F_NAV_SUPPORT ) ];