🐛 Fix three flex layout bugs in drop-area, positions and layout-data

drop_area.cljc: v-end? was guarded by row? instead of col?, making
vertical-end alignment check fire under horizontal layout conditions.
Aligned with v-center? which correctly uses col?.

positions.cljc: In get-base-line, the col? around? branch passed 2 as
a third argument to max instead of as a divisor in (/ free-width
num-lines 2). This made the offset clamp to at least 2 pixels rather
than computing half the per-line free space. Fixed parenthesization.

layout_data.cljc: The second cond branch (and col? space-evenly?
auto-height?) was permanently unreachable because the preceding branch
(and col? space-evenly?) is a strict superset. Removed the dead branch.

Signed-off-by: Andrey Antukh <niwi@niwi.nz>

common/src/app/common/geom/shapes/flex_layout/drop_area.cljc

@@ -81,7 +81,7 @@
         h-center? (and row? (ctl/h-center? frame))
         h-end?    (and row? (ctl/h-end? frame))
         v-center? (and col? (ctl/v-center? frame))
-        v-end?    (and row? (ctl/v-end? frame))
+        v-end?    (and col? (ctl/v-end? frame))
 
         center (gco/shape->center frame)
         start-p (gmt/transform-point-center start-p center transform-inverse)

common/src/app/common/geom/shapes/flex_layout/layout_data.cljc

@@ -369,9 +369,6 @@
         (cond (and col? space-evenly?)
               0
 
-              (and col? space-evenly? auto-height?)
-              0
-
               (and col? space-around?)
               (/ (max layout-gap-row (/ (- height line-height) num-children)) 2)
 

common/src/app/common/geom/shapes/flex_layout/positions.cljc

@@ -61,7 +61,7 @@
         (gpt/add (hv free-width-gap))
 
         around?
-        (gpt/add (hv (max lines-gap-col (/ free-width num-lines) 2)))
+        (gpt/add (hv (max lines-gap-col (/ free-width num-lines 2))))
 
         evenly?
         (gpt/add (hv (max lines-gap-col (/ free-width (inc num-lines)))))))))