remove `keep-all-lines`

quad/quad/scribblings/quad.scrbl

@@ -575,11 +575,10 @@ Vertical space added around a block. Value is a @tech{dimension string}.
 }
 
 @deftogether[(@defthing[#:kind "attribute" keep-first-lines symbol?]
-              @defthing[#:kind "attribute" keep-last-lines symbol?]
-              @defthing[#:kind "attribute" keep-all-lines symbol?])]{
-How many lines of the quad are kept together near a page break. @racket[keep-first-lines] sets the minimum number of lines that appear before a page break; @racket[keep-last-lines] sets the minimum number that appear after. In both cases, they take a non-negative integer string as a value.
+              @defthing[#:kind "attribute" keep-last-lines symbol?])]{
+How many lines of the quad are kept together near a page break. @racket[keep-first-lines] sets the minimum number of lines that appear before a page break; @racket[keep-last-lines] sets the minimum number that appear after. In both cases, they take a non-negative integer string as a value, or @racket["all"]. 
 
-@racket[keep-all-lines] keeps all the lines of a quad on the same page. Activated only when value is @racket["true"]. Be careful with this option — it's possible to make a single quad that is longer than one page, in which case @racketmodname[quadwriter] will ignore the setting to prevent an impossible situation.
+If the value (of one or both attributes) is @racket["all"], then all the lines of the quad are kept the same page. Be careful with this option — it's possible to make a single quad that is longer than one page, in which case @racketmodname[quadwriter] will ignore the setting to prevent an impossible situation.
 }
 
 @defthing[#:kind "attribute" keep-with-next symbol?]{

quad/quadwriter/layout.rkt

@@ -596,16 +596,16 @@
     (define idx (add1 idx0))
     ;; always catch last line of block in this case
     ;; so later cases are guaranteed to have earlier lines.
+    (define keep-first (quad-ref ln :keep-first-lines))
+    (define keep-last (quad-ref ln :keep-last-lines))
     (unless (eq? idx group-len)
       (when (or
-             ;; if we have :keep-all we can skip :keep-first and :keep-last cases
-             (quad-ref ln :keep-all-lines)
+             ;; if we have keep all we can skip :keep-first and :keep-last cases
+             (or (equal? keep-first "all") (equal? keep-last "all"))
              ;; to keep n lines, we only paint the first n - 1
              ;; (because each nobr line sticks to the next)
-             (let ([keep-first (quad-ref ln :keep-first-lines)])
-               (and (number? keep-first) (< idx keep-first)))
-             (let ([keep-last (quad-ref ln :keep-last-lines)])
-               (and (number? keep-last) (< (- group-len keep-last) idx))))
+             (and (number? keep-first) (< idx keep-first))
+             (and (number? keep-last) (< (- group-len keep-last) idx)))
         (make-nobreak! ln)))
     (cons ln reversed-lines)))
 

quad/quadwriter/tags.rkt

@@ -68,7 +68,7 @@
                   :inset-bottom "8"
                   :inset-left "30"
                   :inset-right "30"
-                  :keep-all-lines "yes")
+                  :keep-first-lines "all")
                  attrs) exprs))
 
 (define id (default-tag-function 'id))