fix(frames): Update frame constraints with new frame IDs after \makec…

…olumns

Frames whose constrains are bound to the content frame now synchonize
their right edge to the last column created by the \makecolumns command.

packages/frametricks/init.lua

@@ -174,7 +174,18 @@ function package:registerCommands ()
   end, "Breaks the current frame in two vertically at the current location or at a point <offset> below the current location")
 
   self:registerCommand("makecolumns", function (options, _)
+    local aligned = {}
+    options.columns = options.columns or 2
+    for key in pairs(SILE.frames) do
+      -- this must be checked before makecolumns() call, since the function changes the right() value of content
+      if SILE.getFrame(key):right() == SILE.getFrame("content"):right() and key ~= "content" then
+         table.insert(aligned, key)
+      end
+    end
     makecolumns(options)
+    for _, frame in ipairs(aligned) do
+      SILE.getFrame(frame):constrain("right", SILE.getFrame("content_col"..options.columns-1):right())
+    end
   end, "Split the current frame into multiple columns")
 
   self:registerCommand("breakframehorizontal", function (options, _)