Fix .clang-format and some whitespace errors

.clang-format: UseTab: ForIndentation -> Never

Update fluid generated files

.clang-format

@@ -1,7 +1,7 @@
 #
 # clang-format control file for the FLTK project.
 #
-# Copyright 2017 by Bill Spitzak and others.
+# Copyright 2017-2020 by Bill Spitzak and others.
 #
 # This library is free software. Distribution and use rights are outlined in
 # the file "COPYING" which should have been included with this file.  If this
@@ -64,7 +64,7 @@ BasedOnStyle:                                   LLVM
 # this annoying bug of clang-format.
 #
 # UseTab:                                       Always
-UseTab:                                         ForIndentation
+UseTab:                                         Never
 
 # Should we extend code lines beyond 80 columns ?
 # Default: 80

fluid/widget_panel.cxx

@@ -317,7 +317,6 @@ ive to the origin at construction time");
           { Fl_Value_Input* o = new Fl_Value_Input(95, 185, 55, 20, "Size:");
             o->tooltip("The size of the slider.");
             o->labelsize(11);
-            o->step(0.010101);
             o->textsize(11);
             o->callback((Fl_Callback*)slider_size_cb);
             o->align(Fl_Align(FL_ALIGN_TOP_LEFT));

fluid/widget_panel.fl

@@ -295,7 +295,7 @@ Use Ctrl-J for newlines.} xywh {95 40 190 20} labelfont 1 labelsize 11 when 1 te
           Fl_Value_Input {} {
             label {Size:}
             callback slider_size_cb
-            tooltip {The size of the slider.} xywh {95 185 55 20} labelsize 11 align 5 step 0.010101 textsize 11
+            tooltip {The size of the slider.} xywh {95 185 55 20} labelsize 11 align 5 textsize 11
           }
           Fl_Value_Input {} {
             label {Minimum:}
@@ -674,7 +674,7 @@ wCallback->do_callback(wCallback, v);} open
       Fl_Button {} {
         label Revert
         callback revert_cb
-        comment {Hidden Revert button}
+        comment {Hidden Revert button} selected
         xywh {90 370 60 20} labelsize 11 hide
       }
       Fl_Button wLiveMode {