Simplify code

`a += b` instead of `a = a + b`.

1 files changed, 3 insertions, 3 deletions

diff --git a/ui/filetree_viewmodel.go b/ui/filetree_viewmodel.go
index 7394070..f2186ed 100644
--- a/ui/filetree_viewmodel.go
+++ b/ui/filetree_viewmodel.go
@@ -198,7 +198,7 @@ func (vm *FileTreeViewModel) CursorLeft(filterRegex *regexp.Regexp) error {
 	}
 
 	if vm.bufferIndex > moveIndex {
-		vm.bufferIndex = vm.bufferIndex - moveIndex
+		vm.bufferIndex -= moveIndex
 	} else {
 		vm.bufferIndex = 0
 	}
@@ -258,7 +258,7 @@ func (vm *FileTreeViewModel) PageDown() error {
 		vm.bufferIndex = 0
 		vm.TreeIndex = nextBufferIndexLowerBound
 	} else {
-		vm.bufferIndex = vm.bufferIndex - newLines
+		vm.bufferIndex -= newLines
 	}
 
 	return nil
@@ -284,7 +284,7 @@ func (vm *FileTreeViewModel) PageUp() error {
 		vm.bufferIndex = 0
 		vm.TreeIndex = nextBufferIndexLowerBound
 	} else {
-		vm.bufferIndex = vm.bufferIndex + newLines
+		vm.bufferIndex += newLines
 	}
 	return nil
 }