//erode snowballs: Fix assignment to global variable; slightly refactor changelog

Sincce we've got a number of bugfixes here and the changelog is getting 
a bit longer, I've split bugfixes up.

CHANGELOG.md

@@ -5,8 +5,6 @@ Note to self: See the bottom of this file for the release template text.
 
 ## v1.12: The selection tools update (unreleased)
  - Add `//spush`, `//spop`, and `//sstack`
- - `//overlay`: Don't place nodes above water
- - `//multi`: Improve resilience by handling some edge cases
  - Add `//srect` (_select rectangle_), `//scol` (_select column_), `//scube` (_select cube_) - thanks, @VorTechnix!
  - Add `//scloud` (_select point cloud_), `//scentre` (_select centre node(s)_), `//srel` (_select relative_)  - thanks, @VorTechnix!
  - Significantly refactored backend utility functions (more to come in future updates)
@@ -16,7 +14,12 @@ Note to self: See the bottom of this file for the release template text.
      - Caveat: Percentages are converted to a 1-in-N chance, but additionally that number is rounded down in some places
  - `//torus`, `//hollowtorus`: Add optional new axes
  - `//torus`: Add optional hollow keyword
- - `//layers`: Fix crash duee to outdated debug code
+
+### Bugfixes
+ - `//overlay`: Don't place nodes above water
+ - `//multi`: Improve resilience by handling some edge cases
+ - `//layers`: Fix crash due to outdated debug code
+ - `//erode`/snowballs: Fix assignment to undeclared variable
 
 
 ## v1.11: The big data update (25th January 2021)

worldeditadditions/lib/erode/snowballs.lua

@@ -132,7 +132,7 @@ function worldeditadditions.erode.snowballs(heightmap_initial, heightmap, height
 	if not params.noconv then
 		local success, matrix = worldeditadditions.get_conv_kernel("gaussian", 3, 3)
 		if not success then return success, matrix end
-		matrix_size = {} matrix_size[0] = 3 matrix_size[1] = 3
+		local matrix_size = {} matrix_size[0] = 3 matrix_size[1] = 3
 		worldeditadditions.conv.convolve(
 			heightmap, heightmap_size,
 			matrix,